Manimator in HF

.dockerignore

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+.git
+.gitignore
+.gitattributes
+
+.env*
+src/.env
+
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+venv/
+.venv/
+
+.vscode/
+.idea/
+*.DS_Store
+
+media/*
+!media/.keep # Optional: keep directory structure if needed
+src/media/*
+*.mp4
+*.wav
+*.svg
+*.log
+*.tex
+generated_video.py
+extended_video.mp4
+final_output.mp4
+output_*.wav
+
+
+# Conda environment file (using requirements.txt)
+environment.yml
+
+src/tests/
+
+LICENSE
+README.md
+packages.txt

.gitignore

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+video-gen
+src/media/*
+src/__pycache__/*
+src/services/__pycache__/*
+src/api/__pycache__/*
+src/tests/__pycache__/*
+.env
+media/*
+__pycache__/*
+Manimator/*
+Manimator/
+

Dockerfile

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+FROM python:3.10-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV PYTHONUNBUFFERED=1
+
+# (ffmpeg, latexmk, texlive-full, libcairo2-dev, pkg-config)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+    latexmk \
+    texlive-full \
+    libcairo2-dev \
+    pkg-config \
+    libpango1.0-dev \
+    curl \
+    build-essential \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt .
+
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+COPY src/ ./src/
+
+RUN mkdir -p media/videos/generated_video/1080p60 media/Tex media/texts media/images
+
+EXPOSE 8501
+#streamlit checks
+HEALTHCHECK --interval=15s --timeout=5s --start-period=30s \
+  CMD curl --fail http://localhost:8501/_stcore/health || exit 1
+
+# Pass GEMINI_API_KEY as an environment variable during `docker run`
+# Example: docker run -p 8501:8501 -e GEMINI_API_KEY='your_api_key' manimator-image
+CMD ["streamlit", "run", "src/app.py", "--server.port=8501", "--server.address=0.0.0.0"]

LICENSE

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

environment.yml

@@ -0,0 +1,25 @@
+name: manimator
+channels:
+  - defaults
+  - conda-forge
+  - pytorch
+dependencies:
+  - python=3.10
+  - pip
+  - numpy>=1.24.0
+  - scipy>=1.10.0
+  - libstdcxx-ng  #espeak problem bruh
+  - pip:
+      - streamlit>=1.27.0
+      - manim>=0.17.3
+      - kokoro>=0.3.1
+      - soundfile
+      - google-genai
+      - python-dotenv
+      - transformers
+      - accelerate
+      - httpx>=0.24.0
+  - pytorch
+  - torchvision
+  - torchaudio
+  - google-genai

packages.txt

@@ -0,0 +1,6 @@
+ffmpeg
+latexmk
+texlive-full
+libcairo2-dev
+pkg-config
+libpango1.0-dev

requirements.txt

@@ -0,0 +1,13 @@
+streamlit
+manim
+kokoro>=0.3.1
+soundfile
+google-genai
+python-dotenv
+numpy
+httpx
+torch
+torchvision
+torchaudio
+accelerate
+pydub

src/api/fallback_gemini.py

@@ -0,0 +1,117 @@
+import os
+import re
+from google import genai
+from google.genai import types as genai_types
+import logging
+from .gemini import SYSTEM_PROMPT, base_prompt_instructions
+
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+
+def fix_manim_code(faulty_code: str, error_message: str, original_context: str):
+    api_key = os.getenv("GEMINI_API_KEY")
+    if not api_key:
+        logging.error("GEMINI_API_KEY not found in environment variables for fallback.")
+        return None, None
+
+    client = genai.Client(api_key=api_key)
+
+    fix_prompt_text = (
+        f"The following Manim code, intended to '{original_context}', failed with an error.\n\n"
+        "### FAULTY CODE:\n"
+        f"```python\n{faulty_code}\n```\n\n"
+        "### ERROR MESSAGE:\n"
+        f"```\n{error_message}\n```\n\n"
+        "### INSTRUCTIONS:\n"
+        "1. Analyze the error message and the faulty code.\n"
+        "2. Correct the code to fix the specific error reported.\n"
+        "3. Ensure the corrected code still fulfills the original request and adheres strictly to *all* the requirements listed below.\n"
+        "4. Pay close attention to vector dimensions, matrix operations, allowed Manim methods, and total duration (30 seconds).\n"
+        "5. If the code logic changes significantly, update the narration accordingly.\n"
+        "6. Return *only* the corrected code and narration using the '### MANIM CODE:' and '### NARRATION:' delimiters, just like the original request.\n\n"
+        "### REQUIREMENTS (Apply these to the corrected code):\n"
+        f"{base_prompt_instructions}" 
+    )
+
+    contents = [fix_prompt_text] 
+
+    logging.info("Attempting to fix Manim code via fallback...")
+    try:
+        generation_config = genai_types.GenerateContentConfig(
+            system_instruction=SYSTEM_PROMPT
+        )
+        
+        response = client.models.generate_content(
+                model="gemini-2.0-flash",
+                contents=contents,
+                config=generation_config
+                )
+        if response:
+            try:
+                content = response.text
+                logging.info("Received response from fallback attempt.")
+                
+                if "### NARRATION:" in content:
+                    manim_code, narration = content.split("### NARRATION:", 1)
+                    manim_code = re.sub(r"```python", "", manim_code).replace("```", "").strip()
+                    narration = narration.strip()
+
+                    if "from manim import *" not in manim_code:
+                         logging.warning("Adding missing 'from manim import *' (fallback fix).")
+                         manim_code = "from manim import *\nimport numpy as np\n" + manim_code
+                    elif "import numpy as np" not in manim_code:
+                         logging.warning("Adding missing 'import numpy as np' (fallback fix).")
+                         lines = manim_code.splitlines()
+                         for i, line in enumerate(lines):
+                             if "from manim import *" in line:
+                                 lines.insert(i + 1, "import numpy as np")
+                                 manim_code = "\n".join(lines)
+                                 break
+
+                    logging.info("Successfully parsed fixed code and narration from fallback.")
+                    return {"manim_code": manim_code, "output_file": "output.mp4"}, narration
+                else:
+                    logging.warning("Delimiter '### NARRATION:' not found in fallback response. Attempting fallback extraction.")
+                    code_match = re.search(r'```python(.*?)```', content, re.DOTALL)
+                    if code_match:
+                        manim_code = code_match.group(1).strip()
+                        narration_part = content.split('```', 2)[-1].strip()
+                        narration = narration_part if len(narration_part) > 20 else ""
+                        if not narration:
+                            logging.warning("Fallback narration extraction resulted in empty or very short text (fallback fix).")
+                        else:
+                            logging.info("Successfully parsed code and narration using fallback regex (fallback fix).")
+
+                        if "from manim import *" not in manim_code:
+                             logging.warning("Adding missing 'from manim import *' (fallback fix, regex path).")
+                             manim_code = "from manim import *\nimport numpy as np\n" + manim_code
+                        elif "import numpy as np" not in manim_code:
+                             logging.warning("Adding missing 'import numpy as np' (fallback fix, regex path).")
+                             lines = manim_code.splitlines()
+                             for i, line in enumerate(lines):
+                                 if "from manim import *" in line:
+                                     lines.insert(i + 1, "import numpy as np")
+                                     manim_code = "\n".join(lines)
+                                     break
+
+                        logging.info("Successfully parsed fixed code using fallback extraction.")
+                        return {"manim_code": manim_code, "output_file": "output.mp4"}, narration
+                    else:
+                         logging.error("Fallback extraction failed: No Python code block found in fallback response.")
+                         logging.debug(f"Fallback content without code block:\n{content}")
+                         return None, None
+
+            except ValueError:
+                logging.error("Could not extract text from the fallback response.")
+                if response.prompt_feedback and response.prompt_feedback.block_reason:
+                     logging.error(f"Fallback content generation blocked. Reason: {response.prompt_feedback.block_reason.name}")
+                return None, None
+            except Exception as e:
+                 logging.exception(f"Error processing fallback response: {e}")
+                 return None, None
+        else:
+            logging.error("No response received from Gemini during fallback attempt.")
+            return None, None
+
+    except Exception as e:
+        logging.exception(f"Error calling Gemini API during fallback: {e}")
+        return None, None

src/api/gemini.py

@@ -0,0 +1,208 @@
+import re
+from google import genai
+from google.genai import types as genai_types
+from dotenv import load_dotenv
+import os
+import pathlib
+import logging
+
+load_dotenv()
+
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+
+# --- Global System Prompt ---
+SYSTEM_PROMPT = """You are an expert Manim programmer specializing in creating crazy, cutting-edge, and visually striking animations based on user prompts or documents, strictly following Manim Community v0.19.0 standards.
+
+Core Requirements:
+- **API Version:** Use only Manim Community v0.19.0 API.
+- **Vectors & Math:** Use 3D vectors (`np.array([x, y, 0])`) and ensure correct math operations.
+- **Allowed Methods:** Strictly use the verified list of Manim methods provided in the detailed instructions. No external images.
+- **        "\n   - self.play(), self.wait(), Create(), Write(), Transform(), FadeIn(), FadeOut(), Add(), Remove(), MoveAlongPath(), Rotating(), Circumscribe(), Indicate(), FocusOn(), Shift(), Scale(), MoveTo(), NextTo(), Axes(), Plot(), LineGraph(), BarChart(), Dot(), Line(), Arrow(), Text(), Tex(), MathTex(), VGroup(), Mobject.animate, self.camera.frame.animate"
+- **Matrix Visualization:** Use `MathTex` for displaying matrices in the format `r'\\begin{bmatrix} a & b \\\\ c & d \\end{bmatrix}'`.
+- **Duration:** The total animation duration MUST be exactly 30 seconds.
+-**Error handling**:"An unexpected error occurred during video creation: No Scene class found in generated code, This error SHOULD NEVER occur. Make sure to validate the code before returning it. If this error occurs, please log the error and return None for both manim_code and narration.Make sure you don't do 3Dscene coz that gives this error"
+- **Engagement:** Create visually stunning and crazy animations that push creative boundaries. Use vibrant colors, dynamic movements, and unexpected transformations.
+- **Text Handling:** Fade out text and other elements as soon as they are no longer needed, ensuring a smooth transition.
+- **Synchronization:** Align animation pacing (`run_time`, `wait`) roughly with the narration segments.
+- **Output Format:** Return *only* the Python code and narration script, separated by '### MANIM CODE:' and '### NARRATION:' delimiters. Adhere strictly to this format.
+- **Code Quality:** Generate error-free, runnable code with necessary imports (`from manim import *`, `import numpy as np`) and exactly one Scene class. Validate objects and animation calls.
+"""
+
+# --- Detailed Instructions ---
+base_prompt_instructions = (
+        "\nFollow these requirements strictly:"
+        "\n1. Use only Manim Community v0.19.0 API"
+        "\n2. Vector operations:"
+        "\n   - All vectors must be 3D: np.array([x, y, 0])"
+        "\n   - Matrix multiplication: result = np.dot(matrix, vector[:2])"
+        "\n   - Append 0 for Z: np.append(result, 0)"
+        "\n3. Matrix visualization:"
+        "\n   - Use MathTex for display"
+        "\n   - Format: r'\\begin{bmatrix} a & b \\\\ c & d \\end{bmatrix}'"
+        "\n4. Use only verified Manim methods:" 
+        "\n   - self.play(), self.wait(), Create(), Write(), Transform(), FadeIn(), FadeOut(), Add(), Remove(), MoveAlongPath(), Rotating(), Circumscribe(), Indicate(), FocusOn(), Shift(), Scale(), MoveTo(), NextTo(), Axes(), Plot(), LineGraph(), BarChart(), Dot(), Line(), Arrow(), Text(), Tex(), MathTex(), VGroup(), Mobject.animate, self.camera.frame.animate"
+        "\n5. DO NOT USE IMAGES IMPORTS."
+        "\n6. Make the video crazy and innovative by:"
+        "\n   - Fading out text and other elements gracefully once they are no longer needed"
+        "\n   - Adding creative interactive elements like arrows, labels, and transitions"
+        "\n   - Incorporating graphs/plots (Axes, Plot, LineGraph, BarChart) where appropriate"
+        "\n   - Leveraging smooth transitions and varied pacing to keep the viewer engaged."
+        "\n7. Ensure the video is error-free by:"
+        "\n   - Validating all objects before animations"
+        "\n   - Handling exceptions gracefully (in generated code if applicable)"
+        "\n   - Ensuring operands for vector operations match in shape to avoid broadcasting errors"
+        "\n8. Validate that every arrow creation ensures its start and end points are distinct to prevent normalization errors."
+        "\n9. Use longer scenes (e.g., 5-6 seconds per major step) for complex transformations and shorter scenes for simple animations, with a total duration of exactly 30 seconds."
+        "\n10. Align the narration script with the animation pace for seamless storytelling."
+        "\n11. Ensure all objects in self.play() are valid animations (e.g., `Create(obj)`, `obj.animate.shift(UP)`)."
+        "\n12. Use Mobject.animate for animations involving Mobject methods."
+        "\n13. CRITICAL: DO NOT USE BARCHATS, LINEGRAPHS, OR PLOTTING WITHOUT EXPLICIT INSTRUCTIONS."
+        "\n14. Provide creative and sometimes crazy Manim video scripts that push the conventional boundaries."
+        "\n15. **Synchronization:** Structure the narration and Manim code for better synchronization:"
+        "\n    - Keep narration segments concise and directly tied to the visual elements."
+        "\n    - Use `self.wait(duration)` in the Manim code to match natural pauses in narration."
+        "\n    - Adjust `run_time` in `self.play()` calls to match the speaking duration of the associated narration."
+        "\n    - Ensure the animation and narration sum to exactly 30 seconds."
+        "\n### MANIM CODE:\n"
+        "Provide only valid Python code using Manim Community v0.19.0 to generate the video animation.\n\n"
+        "### NARRATION:\n"
+        "Provide a concise narration script for the video that aligns with the Manim code's pacing and visuals.DO NOT give timestamps.\n\n"
+    )
+
+
+def load_manim_examples():
+    guide_path = pathlib.Path(__file__).parent / "guide.md"
+    if not guide_path.exists():
+        logging.warning(f"Manim examples guide not found at {guide_path}")
+        return ""
+    
+    logging.info(f"Loading Manim examples from {guide_path}")
+    return guide_path.read_text(encoding="utf-8")
+
+
+def generate_video(idea: str | None = None, pdf_path: str | None = None):
+    api_key = os.getenv("GEMINI_API_KEY")
+    if not api_key:
+        logging.error("GEMINI_API_KEY not found in environment variables")
+        raise Exception("GEMINI_API_KEY not found in environment variables")
+
+    if not idea and not pdf_path:
+        raise ValueError("Either an idea or a pdf_path must be provided.")
+    if idea and pdf_path:
+        logging.warning("Both idea and pdf_path provided. Using pdf_path.")
+        idea = None
+
+    client = genai.Client(api_key=api_key)
+    contents = []
+    
+    manim_examples = load_manim_examples()
+    if manim_examples:
+        examples_prompt = "Below are examples of Manim code that demonstrate proper usage patterns. Use these as reference when generating your animation:\n\n" + manim_examples
+        contents.append(examples_prompt)
+        logging.info("Added Manim examples from guide.md to prime the model")
+    else:
+        logging.warning("No Manim examples were loaded from guide.md")
+    
+    user_prompt_text = ""
+
+    if pdf_path:
+        pdf_file_path = pathlib.Path(pdf_path)
+        if not pdf_file_path.exists():
+             logging.error(f"PDF file not found at: {pdf_path}")
+             raise FileNotFoundError(f"PDF file not found at: {pdf_path}")
+
+        logging.info(f"Reading PDF: {pdf_path}")
+        pdf_data = pdf_file_path.read_bytes()
+        pdf_part = genai_types.Part.from_bytes(data=pdf_data, mime_type='application/pdf')
+        contents.append(pdf_part)
+
+        user_prompt_text = f"Create a 30-second Manim video script summarizing the key points or illustrating a core concept from the provided PDF document. {base_prompt_instructions}"
+        contents.append(user_prompt_text)
+
+    elif idea:
+        logging.info(f"Generating video based on idea: {idea[:50]}...")
+        user_prompt_text = f"Create a 30-second Manim video script about '{idea}'. {base_prompt_instructions}"
+        contents.append(user_prompt_text)
+
+    logging.info("Sending request to Gemini API...")
+    try:
+        generation_config = genai_types.GenerateContentConfig(
+        system_instruction=SYSTEM_PROMPT
+    )
+    
+        response = client.models.generate_content(
+            model="gemini-1.5-pro",
+            contents=contents,
+            config=generation_config
+            )
+    except Exception as e:
+        logging.exception(f"Error calling Gemini API: {e}")
+        raise Exception(f"Error calling Gemini API: {e}")
+
+    if response:
+        try:
+            content = response.text
+            logging.info("Received response from Gemini.")
+        except ValueError:
+             logging.warning("Could not extract text from the response. Response details:")
+             logging.warning(response)
+             if response.prompt_feedback and response.prompt_feedback.block_reason:
+                 logging.error(f"Content generation blocked. Reason: {response.prompt_feedback.block_reason.name}")
+                 raise Exception(f"Content generation blocked. Reason: {response.prompt_feedback.block_reason.name}")
+             else:
+                 logging.error("Failed to generate content. The response was empty or malformed.")
+                 raise Exception("Failed to generate content. The response was empty or malformed.")
+
+        if "### NARRATION:" in content:
+            manim_code, narration = content.split("### NARRATION:", 1)
+            manim_code = re.sub(r"```python", "", manim_code).replace("```", "").strip()
+            narration = narration.strip()
+            logging.info("Successfully parsed code and narration using delimiter.")
+
+            if "from manim import *" not in manim_code:
+                 logging.warning("Adding missing 'from manim import *'.")
+                 manim_code = "from manim import *\nimport numpy as np\n" + manim_code
+            elif "import numpy as np" not in manim_code:
+                 logging.warning("Adding missing 'import numpy as np'.")
+                 lines = manim_code.splitlines()
+                 for i, line in enumerate(lines):
+                     if "from manim import *" in line:
+                         lines.insert(i + 1, "import numpy as np")
+                         manim_code = "\n".join(lines)
+                         break
+
+            return {"manim_code": manim_code, "output_file": "output.mp4"}, narration
+        else:
+            logging.warning("Delimiter '### NARRATION:' not found. Attempting fallback extraction.")
+            code_match = re.search(r'```python(.*?)```', content, re.DOTALL)
+            if code_match:
+                manim_code = code_match.group(1).strip()
+                narration_part = content.split('```', 2)[-1].strip()
+                narration = narration_part if len(narration_part) > 20 else ""
+                if not narration:
+                    logging.warning("Fallback narration extraction resulted in empty or very short text.")
+                else:
+                    logging.info("Successfully parsed code and narration using fallback regex.")
+
+                if "from manim import *" not in manim_code:
+                     logging.warning("Adding missing 'from manim import *' (fallback).")
+                     manim_code = "from manim import *\nimport numpy as np\n" + manim_code
+                elif "import numpy as np" not in manim_code:
+                     logging.warning("Adding missing 'import numpy as np' (fallback).")
+                     lines = manim_code.splitlines()
+                     for i, line in enumerate(lines):
+                         if "from manim import *" in line:
+                             lines.insert(i + 1, "import numpy as np")
+                             manim_code = "\n".join(lines)
+                             break
+
+                return {"manim_code": manim_code, "output_file": "output.mp4"}, narration
+            else:
+                 logging.error("Fallback extraction failed: No Python code block found in response.")
+                 logging.debug(f"Content without code block:\n{content}")
+                 raise Exception("The response does not contain the expected '### NARRATION:' delimiter or a valid Python code block.")
+
+    else:
+        logging.error("Error generating video content. No response received from Gemini.")
+        raise Exception("Error generating video content. No response received.")
+

src/api/guide.md

@@ -0,0 +1,332 @@
+# Manim Code Examples (Community v0.19.0)
+
+## Example 1: Basic Shapes and Text
+
+**Description:** Shows a circle and text, then fades them out.
+
+```python
+# ### MANIM CODE:
+from manim import *
+import numpy as np
+
+class BasicShapes(Scene):
+    def construct(self):
+        circle = Circle(color=BLUE, fill_opacity=0.5)
+        text = Text("Hello Manim!").next_to(circle, DOWN)
+        self.play(Create(circle), Write(text), run_time=5) # Longer duration for narration
+        self.wait(5) # Pause for narration
+        self.play(FadeOut(circle), FadeOut(text), run_time=5)
+        self.wait(15) # Fill remaining time
+```
+
+```text
+# ### NARRATION:
+Here we create a blue circle and display the text "Hello Manim!" below it. After a brief pause, both elements fade away.
+```
+
+## Example 2: Vector Transformation with Labels
+
+**Description:** Creates a vector, displays a transformation matrix, applies the transformation, and labels the steps.
+
+```python
+# ### MANIM CODE:
+from manim import *
+import numpy as np
+
+class VectorTransform(Scene):
+    def construct(self):
+        # Setup
+        axes = Axes(x_range=[-5, 5, 1], y_range=[-5, 5, 1], x_length=6, y_length=6)
+        vec_start = np.array([1, 1, 0])
+        matrix = np.array([[0, -1], [1, 0]]) # 90 deg rotation
+
+        # Initial vector
+        vector = Arrow(ORIGIN, vec_start, buff=0, color=YELLOW)
+        vec_label = MathTex("v", color=YELLOW).next_to(vector.get_end(), UR, buff=0.1)
+        self.play(Create(axes), Create(vector), Write(vec_label), run_time=6) # Show initial state
+
+        # Matrix
+        matrix_tex = MathTex(r"M = \begin{bmatrix} 0 & -1 \\ 1 & 0 \end{bmatrix}", color=RED).to_corner(UL)
+        self.play(Write(matrix_tex), run_time=4) # Introduce matrix
+
+        # Transformation
+        vec_end = np.append(np.dot(matrix, vec_start[:2]), 0)
+        new_vector = Arrow(ORIGIN, vec_end, buff=0, color=GREEN)
+        new_vec_label = MathTex("Mv", color=GREEN).next_to(new_vector.get_end(), UR, buff=0.1)
+        transform_label = Text("Applying 90° Rotation", font_size=24).next_to(matrix_tex, DOWN, aligned_edge=LEFT)
+
+        self.play(Write(transform_label), run_time=3) # Explain transform
+        self.play(Transform(vector, new_vector), Transform(vec_label, new_vec_label), run_time=7) # Show transform
+
+        self.wait(10) # Hold final state
+```
+
+```text
+# ### NARRATION:
+We start with vector v in yellow on the coordinate plane. This is the rotation matrix M we'll use. Now, we apply the matrix M to rotate vector v by 90 degrees, resulting in the green vector Mv.
+```
+## Example 3: BraceAnnotation
+
+**Description:** Shows how to create braces and attach text/latex to them.
+
+```python
+# ### MANIM CODE:
+from manim import *
+import numpy as np
+
+class BraceAnnotation(Scene):
+    def construct(self):
+        dot = Dot([-2, -1, 0])
+        dot2 = Dot([2, 1, 0])
+        line = Line(dot.get_center(), dot2.get_center()).set_color(ORANGE)
+        b1 = Brace(line)
+        b1text = b1.get_text("Horizontal distance")
+        b2 = Brace(line, direction=line.copy().rotate(PI / 2).get_unit_vector())
+        b2text = b2.get_tex("x-x_1")
+        
+        self.play(Create(line), Create(dot), Create(dot2), run_time=3)
+        self.play(Create(b1), Write(b1text), run_time=3)
+        self.play(Create(b2), Write(b2text), run_time=3)
+        self.wait(21) # Fill remaining time
+```
+
+```text
+# ### NARRATION:
+Here we demonstrate how to add annotations with braces. First, we create a line between two dots. Then we add a horizontal brace with text below it showing "Horizontal distance." Finally, we add a vertical brace with mathematical notation showing the difference between x coordinates.
+```
+
+## Example 4: SinAndCosFunctionPlot
+
+**Description:** Plots sine and cosine functions on an axis with labels.
+
+```python
+# ### MANIM CODE:
+from manim import *
+import numpy as np
+
+class SinAndCosFunctionPlot(Scene):
+    def construct(self):
+        axes = Axes(
+            x_range=[-10, 10.3, 1],
+            y_range=[-1.5, 1.5, 1],
+            x_length=10,
+            axis_config={"color": GREEN},
+            x_axis_config={
+                "numbers_to_include": np.arange(-10, 10.01, 2),
+                "numbers_with_elongated_ticks": np.arange(-10, 10.01, 2),
+            },
+            tips=False,
+        )
+        axes_labels = axes.get_axis_labels()
+        sin_graph = axes.plot(lambda x: np.sin(x), color=BLUE)
+        cos_graph = axes.plot(lambda x: np.cos(x), color=RED)
+
+        sin_label = axes.get_graph_label(
+            sin_graph, "\\sin(x)", x_val=-10, direction=UP / 2
+        )
+        cos_label = axes.get_graph_label(cos_graph, label="\\cos(x)")
+
+        vert_line = axes.get_vertical_line(
+            axes.i2gp(TAU, cos_graph), color=YELLOW, line_func=Line
+        )
+        line_label = axes.get_graph_label(
+            cos_graph, r"x=2\pi", x_val=TAU, direction=UR, color=WHITE
+        )
+
+        # Animation sequence
+        self.play(Create(axes), Write(axes_labels), run_time=3)
+        self.play(Create(sin_graph), Create(cos_graph), run_time=5)
+        self.play(Write(sin_label), Write(cos_label), run_time=3)
+        self.play(Create(vert_line), Write(line_label), run_time=3)
+        self.wait(16) # Fill remaining time
+```
+
+```text
+# ### NARRATION:
+In this animation, we plot the sine and cosine functions on a coordinate plane. The sine function is shown in blue, while the cosine function is shown in red. We add labels to each curve and mark a vertical line at x equals 2π to highlight this important value. Notice how the curves oscillate between -1 and 1 as they extend across the x-axis.
+```
+
+## Example 5: PointMovingOnShapes
+
+**Description:** Demonstrates how to animate a dot moving along paths and rotating.
+
+```python
+# ### MANIM CODE:
+from manim import *
+import numpy as np
+
+class PointMovingOnShapes(Scene):
+    def construct(self):
+        circle = Circle(radius=1, color=BLUE)
+        dot = Dot()
+        dot2 = dot.copy().shift(RIGHT)
+        self.add(dot)
+
+        line = Line([3, 0, 0], [5, 0, 0])
+        self.play(Create(line), run_time=2)
+        self.play(GrowFromCenter(circle), run_time=2)
+        self.play(Transform(dot, dot2), run_time=2)
+        self.play(MoveAlongPath(dot, circle), run_time=7, rate_func=linear)
+        self.play(Rotating(dot, about_point=[2, 0, 0]), run_time=7)
+        self.wait(10) # Fill remaining time
+```
+
+```text
+# ### NARRATION:
+Here we demonstrate moving and transforming objects. We begin with a dot and create a line and circle. Then, we transform the dot by shifting it to the right. Watch as the dot moves along the circular path at a constant speed. Finally, the dot rotates around a fixed point, showing how we can create complex animations by combining different movements.
+```
+
+## Example 6: ThreeDSurfacePlot
+
+**Description:** Creates a 3D Gaussian surface plot with colored checkerboard pattern.
+
+```python
+# ### MANIM CODE:
+from manim import *
+import numpy as np
+
+class ThreeDSurfacePlot(ThreeDScene):
+    def construct(self):
+        resolution_fa = 24
+        self.set_camera_orientation(phi=75 * DEGREES, theta=-30 * DEGREES)
+
+        def param_gauss(u, v):
+            x = u
+            y = v
+            sigma, mu = 0.4, [0.0, 0.0]
+            d = np.linalg.norm(np.array([x - mu[0], y - mu[1]]))
+            z = np.exp(-(d ** 2 / (2.0 * sigma ** 2)))
+            return np.array([x, y, z])
+
+        gauss_plane = Surface(
+            param_gauss,
+            resolution=(resolution_fa, resolution_fa),
+            v_range=[-2, +2],
+            u_range=[-2, +2]
+        )
+
+        gauss_plane.scale(2, about_point=ORIGIN)
+        gauss_plane.set_style(fill_opacity=1, stroke_color=GREEN)
+        gauss_plane.set_fill_by_checkerboard(ORANGE, BLUE, opacity=0.5)
+        axes = ThreeDAxes()
+        
+        self.play(Create(axes), run_time=2)
+        self.play(Create(gauss_plane), run_time=3)
+        self.begin_ambient_camera_rotation(rate=0.1)
+        self.wait(25) # Fill remaining time
+```
+
+```text
+# ### NARRATION:
+In this animation, we're creating a three-dimensional Gaussian surface plot. We first set up the camera angle to view our 3D scene properly. The surface is defined by a Gaussian function that creates a bell curve shape in three dimensions. We apply a checkerboard pattern with orange and blue colors to highlight the surface features. Notice how the ambient camera rotation helps us visualize the 3D nature of the surface from multiple angles.
+```
+
+## Example 7: MovingAngle
+
+**Description:** Shows an animated angle that changes based on a ValueTracker.
+
+```python
+# ### MANIM CODE:
+from manim import *
+import numpy as np
+
+class MovingAngle(Scene):
+    def construct(self):
+        rotation_center = LEFT
+
+        theta_tracker = ValueTracker(110)
+        line1 = Line(LEFT, RIGHT)
+        line_moving = Line(LEFT, RIGHT)
+        line_ref = line_moving.copy()
+        line_moving.rotate(
+            theta_tracker.get_value() * DEGREES, about_point=rotation_center
+        )
+        a = Angle(line1, line_moving, radius=0.5, other_angle=False)
+        tex = MathTex(r"\theta").move_to(
+            Angle(
+                line1, line_moving, radius=0.5 + 3 * SMALL_BUFF, other_angle=False
+            ).point_from_proportion(0.5)
+        )
+
+        self.play(Create(line1), Create(line_moving), run_time=2)
+        self.play(Create(a), Write(tex), run_time=2)
+        self.wait(2)
+
+        line_moving.add_updater(
+            lambda x: x.become(line_ref.copy()).rotate(
+                theta_tracker.get_value() * DEGREES, about_point=rotation_center
+            )
+        )
+
+        a.add_updater(
+            lambda x: x.become(Angle(line1, line_moving, radius=0.5, other_angle=False))
+        )
+        tex.add_updater(
+            lambda x: x.move_to(
+                Angle(
+                    line1, line_moving, radius=0.5 + 3 * SMALL_BUFF, other_angle=False
+                ).point_from_proportion(0.5)
+            )
+        )
+
+        self.play(theta_tracker.animate.set_value(40), run_time=3)
+        self.play(theta_tracker.animate.increment_value(140), run_time=3)
+        self.play(tex.animate.set_color(RED), run_time=1)
+        self.play(theta_tracker.animate.set_value(350), run_time=7)
+        self.wait(10) # Fill remaining time
+```
+
+```text
+# ### NARRATION:
+This animation demonstrates how to create a dynamic angle that updates as values change. We start with two lines forming an angle of 110 degrees. Using updaters and a ValueTracker, we can animate the angle changing smoothly. Watch as we decrease the angle to 40 degrees, then increase it by 140 degrees. As the angle continues to change, we also highlight the theta symbol in red before completing a full rotation to 350 degrees.
+```
+
+## Example 8: GraphAreaPlot
+
+**Description:** Demonstrates how to show areas between curves and Riemann rectangles.
+
+```python
+# ### MANIM CODE:
+from manim import *
+import numpy as np
+
+class GraphAreaPlot(Scene):
+    def construct(self):
+        ax = Axes(
+            x_range=[0, 5],
+            y_range=[0, 6],
+            x_axis_config={"numbers_to_include": [2, 3]},
+            tips=False,
+        )
+
+        labels = ax.get_axis_labels()
+
+        curve_1 = ax.plot(lambda x: 4 * x - x ** 2, x_range=[0, 4], color=BLUE_C)
+        curve_2 = ax.plot(
+            lambda x: 0.8 * x ** 2 - 3 * x + 4,
+            x_range=[0, 4],
+            color=GREEN_B,
+        )
+
+        line_1 = ax.get_vertical_line(ax.input_to_graph_point(2, curve_1), color=YELLOW)
+        line_2 = ax.get_vertical_line(ax.i2gp(3, curve_1), color=YELLOW)
+
+        riemann_area = ax.get_riemann_rectangles(
+            curve_1, x_range=[0.3, 0.6], dx=0.03, color=BLUE, fill_opacity=0.5
+        )
+        area = ax.get_area(
+            curve_2, [2, 3], bounded_graph=curve_1, color=GREY, opacity=0.5
+        )
+
+        self.play(Create(ax), Write(labels), run_time=3)
+        self.play(Create(curve_1), Create(curve_2), run_time=4)
+        self.play(Create(line_1), Create(line_2), run_time=3)
+        self.play(FadeIn(riemann_area), run_time=3) 
+        self.play(FadeIn(area), run_time=3)
+        self.wait(14) # Fill remaining time
+```
+
+```text
+# ### NARRATION:
+In this animation, we visualize areas between curves using Manim's plotting capabilities. We create two functions, shown in blue and green, and mark two vertical lines at x equals 2 and x equals 3. The small blue rectangles demonstrate Riemann sums, which approximate the area under a curve. The gray shaded region shows the area between both curves from x equals 2 to x equals 3. These visualizations are powerful tools for understanding calculus concepts like integration and area between curves.
+```

src/app.py

@@ -0,0 +1,187 @@
+import streamlit as st
+import os
+import tempfile
+import subprocess
+import logging
+
+from api.gemini import generate_video
+from api.fallback_gemini import fix_manim_code
+from services.manim_service import create_manim_video
+from services.tts_service import generate_audio
+
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+
+def main():
+    st.title("Manimator")
+    st.write("Generate videos from text ideas or PDF files, You can also just paste arxiv links ;p")
+    input_type = st.radio("Choose input type:", ("Text Idea", "Upload PDF"))
+
+    idea = None
+    uploaded_file = None
+    pdf_path = None
+    original_context = ""
+    audio_file = None
+    current_audio_file = None
+    if input_type == "Text Idea":
+        idea = st.text_area("Enter your idea:")
+        if idea:
+            original_context = idea
+    else:
+        uploaded_file = st.file_uploader("Choose a PDF file", type="pdf")
+        if uploaded_file:
+            original_context = f"Summary/concept from PDF: {uploaded_file.name}"
+
+    if st.button("Generate Video"):
+        temp_pdf_file = None
+        video_data = None
+        script = None
+        audio_file = None
+        final_video = None
+        max_retries = 1
+
+        try:
+            if input_type == "Text Idea" and idea:
+                with st.spinner("Generating initial script and code from idea..."):
+                    logging.info(f"Generating video from idea: {idea[:50]}...")
+                    video_data, script = generate_video(idea=idea)
+            elif input_type == "Upload PDF" and uploaded_file is not None:
+                with st.spinner("Generating initial script and code from PDF..."):
+                    logging.info(f"Generating video from PDF: {uploaded_file.name}")
+                    with tempfile.NamedTemporaryFile(delete=False, suffix=".pdf") as temp_pdf:
+                        temp_pdf.write(uploaded_file.getvalue())
+                        pdf_path = temp_pdf.name
+                        temp_pdf_file = pdf_path
+                    video_data, script = generate_video(pdf_path=pdf_path)
+            else:
+                st.error("Please provide an idea or upload a PDF.")
+                return
+
+            if not video_data or not script:
+                 st.error("Failed to generate initial script/code from Gemini.")
+                 return
+
+            with st.spinner("Generating audio..."):
+                 logging.info("Generating audio for the script.")
+                 try:
+                     audio_file = generate_audio(script)
+                 except ValueError as e:
+                     st.warning(f"Could not generate audio: {e}. Proceeding without audio.")
+                     audio_file = None
+
+            current_manim_code = video_data["manim_code"]
+            current_script = script
+            current_audio_file = audio_file
+
+            for attempt in range(max_retries + 1):
+                try:
+                    with st.spinner(f"Attempt {attempt + 1}: Creating Manim video..."):
+                        logging.info(f"Attempt {attempt + 1} to create Manim video.")
+                        final_video = create_manim_video(
+                            {"manim_code": current_manim_code, "output_file": "output.mp4"},
+                            current_manim_code,
+                            audio_file=current_audio_file
+                        )
+                    logging.info("Manim video creation successful.")
+                    break
+                except subprocess.CalledProcessError as e:
+                    logging.error(f"Manim execution failed on attempt {attempt + 1}.")
+                    st.warning(f"Attempt {attempt + 1} failed. Manim error:\n```\n{e.stderr.decode() if e.stderr else 'No stderr captured.'}\n```")
+                    if attempt < max_retries:
+                        st.info("Attempting to fix the code using fallback...")
+                        logging.info("Calling fallback Gemini to fix code.")
+                        error_message = e.stderr.decode() if e.stderr else "Manim execution failed without specific error output."
+
+                        fixed_video_data, fixed_script = fix_manim_code(
+                            faulty_code=current_manim_code,
+                            error_message=error_message,
+                            original_context=original_context
+                        )
+
+                        if fixed_video_data and fixed_script is not None:
+                            st.success("Fallback successful! Retrying video generation with fixed code.")
+                            logging.info("Fallback successful. Received fixed code.")
+                            current_manim_code = fixed_video_data["manim_code"]
+                            if fixed_script != current_script and fixed_script:
+                                st.info("Narration script was updated by the fallback. Regenerating audio...")
+                                logging.info("Regenerating audio for updated script.")
+                                current_script = fixed_script
+                                try:
+                                     current_audio_file = generate_audio(current_script)
+                                except ValueError as e:
+                                     st.warning(f"Could not generate audio for fixed script: {e}. Proceeding without audio.")
+                                     current_audio_file = None
+                            elif not fixed_script:
+                                 st.warning("Fallback provided code but no narration. Using original audio (if any).")
+                                 logging.warning("Fallback provided empty narration.")
+                                 current_script = ""
+                                 current_audio_file = None
+                            else:
+                                logging.info("Fallback kept the original narration.")
+                        else:
+                            st.error("Fallback failed to fix the code. Stopping.")
+                            logging.error("Fallback failed to return valid code/script.")
+                            final_video = None
+                            break
+                    else:
+                        st.error(f"Manim failed after {max_retries + 1} attempts. Could not generate video.")
+                        logging.error(f"Manim failed after {max_retries + 1} attempts.")
+                        final_video = None
+                except Exception as e:
+                    st.error(f"An unexpected error occurred during video creation: {str(e)}")
+                    logging.exception("Unexpected error during create_manim_video call.")
+                    final_video = None
+                    break
+
+            if final_video and os.path.exists(final_video):
+                st.success("Video generated successfully!")
+                st.video(final_video)
+                st.write("Generated Narration:")
+                st.text_area("Narration", current_script if current_script is not None else "Narration could not be generated.", height=150)
+            elif not final_video:
+                 pass
+            else:
+                st.error("Error: Generated video file not found after processing.")
+                logging.error(f"Final video file '{final_video}' not found.")
+
+        except FileNotFoundError as e:
+             st.error(f"Error: A required file was not found. {str(e)}")
+             logging.exception("FileNotFoundError during generation process.")
+        except ValueError as e:
+             st.error(f"Input Error: {str(e)}")
+             logging.exception("ValueError during generation process.")
+        except Exception as e:
+            st.error(f"An unexpected error occurred: {str(e)}")
+            logging.exception("Unhandled exception in main generation block.")
+        finally:
+            if temp_pdf_file and os.path.exists(temp_pdf_file):
+                try:
+                    os.remove(temp_pdf_file)
+                    logging.info(f"Removed temporary file: {temp_pdf_file}")
+                except OSError as e:
+                    logging.error(f"Error removing temporary file {temp_pdf_file}: {e}")
+            if audio_file and os.path.exists(audio_file) and audio_file != current_audio_file:
+                 try:
+                     os.remove(audio_file)
+                     logging.info(f"Removed temporary audio file: {audio_file}")
+                 except OSError as e:
+                     logging.error(f"Error removing temporary audio file {audio_file}: {e}")
+            if current_audio_file and os.path.exists(current_audio_file):
+                 try:
+                     os.remove(current_audio_file)
+                     logging.info(f"Removed potentially updated temporary audio file: {current_audio_file}")
+                 except OSError as e:
+                     logging.error(f"Error removing potentially updated temporary audio file {current_audio_file}: {e}")
+    st.markdown("<br><br>", unsafe_allow_html=True) 
+    st.markdown("---")
+    
+    
+    st.markdown("""
+        ### Want to help improve this app?
+        - Give good Manim Examples and make PRs in guide.md, find it in repo [GitHub](https://github.com/mostlykiguess/Manimator)
+        - Report issues on [GitHub Issues](https://github.com/mostlykiguess/Manimator/issues)
+        - Email problematic prompts to me 
+        """)
+    
+
+if __name__ == "__main__":
+    main()

src/services/manim_service.py

@@ -0,0 +1,92 @@
+import re
+import subprocess
+import os
+import glob
+import logging
+
+def get_scene_name(manim_code):
+    match = re.search(r'class\s+(\w+)\s*\(\s*Scene\s*\)', manim_code)
+    if match:
+        return match.group(1)
+    raise ValueError("No Scene class found in generated code")
+
+def create_manim_video(video_data, manim_code, audio_file=None):
+    logging.info("Starting to create Manim video")
+    with open("generated_video.py", "w") as f:
+        manim_code_clean = re.sub(r"```python", "", manim_code)
+        manim_code_clean = manim_code_clean.replace("```", "").strip()
+        f.write(manim_code_clean)
+    
+    scene_name = get_scene_name(manim_code_clean)
+    logging.info(f"Identified scene name: {scene_name}")
+    
+    command = ["manim", "-qh", "generated_video.py", scene_name]
+    logging.info(f"Running Manim with command: {' '.join(command)}")
+    subprocess.run(command, check=True)
+    
+    search_pattern = os.path.join("media", "videos", "generated_video", "1080p60", f"{scene_name}.mp4")
+    if not os.path.exists(search_pattern):
+        logging.error(f"No rendered video found at: {search_pattern}")
+        raise Exception(f"No rendered video found for scene {scene_name}")
+    
+    output_video = search_pattern
+    final_output = "final_output.mp4"
+
+    if audio_file and os.path.exists(audio_file):
+        logging.info(f"Merging video with audio file: {audio_file}")
+        
+        video_duration_cmd = ["ffprobe", "-v", "error", "-show_entries", "format=duration", 
+                             "-of", "default=noprint_wrappers=1:nokey=1", output_video]
+        audio_duration_cmd = ["ffprobe", "-v", "error", "-show_entries", "format=duration", 
+                             "-of", "default=noprint_wrappers=1:nokey=1", audio_file]
+        
+        video_duration = float(subprocess.check_output(video_duration_cmd).decode('utf-8').strip())
+        audio_duration = float(subprocess.check_output(audio_duration_cmd).decode('utf-8').strip())
+        
+        logging.info(f"Video duration: {video_duration}s, Audio duration: {audio_duration}s")
+        
+        if audio_duration > video_duration:
+            logging.info("Audio is longer than video, extending video duration")
+            extended_video = "extended_video.mp4"
+            padding_time = audio_duration - video_duration
+            
+            extend_cmd = [
+                "ffmpeg", "-y",
+                "-i", output_video,
+                "-f", "lavfi", "-i", "color=black:s=1920x1080:r=60",
+                "-filter_complex", f"[0:v][1:v]concat=n=2:v=1:a=0[outv]",
+                "-map", "[outv]",
+                "-c:v", "libx264",
+                "-t", str(audio_duration),
+                extended_video
+            ]
+            
+            logging.info(f"Extending video with command: {' '.join(extend_cmd)}")
+            subprocess.run(extend_cmd, check=True)
+            output_video = extended_video
+        
+        merge_cmd = [
+            "ffmpeg", "-y",
+            "-i", output_video,
+            "-i", audio_file,
+            "-c:v", "copy",
+            "-c:a", "aac",
+            "-map", "0:v:0",
+            "-map", "1:a:0",
+            final_output
+        ]
+        
+        logging.info(f"Merging with command: {' '.join(merge_cmd)}")
+        subprocess.run(merge_cmd, check=True)
+        output_video = final_output
+        
+        if os.path.exists("extended_video.mp4"):
+            os.remove("extended_video.mp4")
+            logging.info("Removed temporary extended video file")
+
+    if os.path.exists("generated_video.py"):
+        os.remove("generated_video.py")
+        logging.info("Removed generated_video.py")
+
+    logging.info(f"Final video created at: {output_video}")
+    return output_video

src/services/tts_service.py

@@ -0,0 +1,44 @@
+from kokoro import KPipeline
+import soundfile as sf
+import os
+from typing import Optional
+
+class TTSService:
+    def __init__(self, lang_code: str = 'a'):
+        """Initialize the TTS service with Kokoro"""
+        self.pipeline = KPipeline(lang_code=lang_code)
+        self.voice_presets = {
+            'en-us': 'af_heart',  # American English
+            'en-uk': 'bf_heart',  # British English
+            'es': 'es_heart',     # Spanish
+            'fr': 'fr_heart',     # French
+            'hi': 'hi_heart',     # Hindi
+            'it': 'it_heart',     # Italian
+            'pt-br': 'pt_heart',  # Brazilian Portuguese
+            'ja': 'ja_heart',     # Japanese
+            'zh': 'zh_heart',     # Mandarin Chinese
+        }
+
+    def generate(self, text: str, voice: str = 'en-us', output_path: Optional[str] = None) -> str:
+        if not text:
+            raise ValueError("Text cannot be empty")
+            
+        if voice not in self.voice_presets:
+            raise ValueError(f"Unsupported voice: {voice}. Available voices: {list(self.voice_presets.keys())}")
+
+        if output_path is None:
+            output_path = f'output_{voice}.wav'
+        
+        generator = self.pipeline(text, voice=self.voice_presets[voice], speed=1, split_pattern=r'\n+')
+        audio_data = []
+        for _, _, audio in generator:
+            audio_data.extend(audio)
+        
+        sf.write(output_path, audio_data, 24000)
+        
+        return output_path
+
+def generate_audio(text: str, voice: str = 'en-us') -> str:
+    """Generate audio from text using Kokoro TTS"""
+    service = TTSService()
+    return service.generate(text, voice)

src/tests/test_services.py

@@ -0,0 +1,163 @@
+# generated by AI to test stuff
+# Python
+import os
+import glob
+import time
+import unittest
+import subprocess
+
+from services.tts_service import generate_audio
+from services.manim_service import create_manim_video
+
+# Import AudioSegment from pydub to check audio properties.
+from pydub import AudioSegment
+
+
+class TestTTSService(unittest.TestCase):
+    def setUp(self):
+        # Cleanup previous output file if exists.
+        self.audio_file = "output.wav"
+        if os.path.exists(self.audio_file):
+            os.remove(self.audio_file)
+    
+    def test_generate_audio(self):
+        sample_text = "This is a test narration for the TTS service."
+        output_file = generate_audio(sample_text)
+        # Check that the file was created and is non-empty.
+        self.assertTrue(os.path.exists(output_file), "TTS output file was not created.")
+        self.assertGreater(os.path.getsize(output_file), 0, "TTS output file is empty.")
+        
+        # Load the generated audio to check its duration and loudness.
+        audio = AudioSegment.from_wav(output_file)
+        self.assertGreater(audio.duration_seconds, 0, "TTS audio file has zero duration.")
+        self.assertNotEqual(audio.dBFS, float("-inf"), "Generated audio is completely silent.")
+        self.assertGreater(audio.dBFS, -35, "Audio seems too quiet; it may be silent.")
+        
+        # Leave the file on disk so it can be inspected.
+        print(f"Test audio file saved at: {os.path.abspath(output_file)}")
+
+
+
+class TestManimService(unittest.TestCase):
+    def setUp(self):
+        # Remove the generated video python file if it exists.
+        self.manim_py = "generated_video.py"
+        if os.path.exists(self.manim_py):
+            os.remove(self.manim_py)
+        # Remove previous output videos from Manim by searching the typical output folder.
+        self.video_files = glob.glob("media/videos/generated_video/**/*.mp4", recursive=True)
+        for f in self.video_files:
+            os.remove(f)
+    
+    def test_create_manim_video_with_audio(self):
+        # Create a dummy manim code that creates a scene lasting at least 5 seconds.
+        dummy_code = """
+from manim import *
+
+class TestScene(Scene):
+    def construct(self):
+        self.wait(5)
+"""
+        video_data = {"output_file": "output.mp4", "manim_code": dummy_code}
+        
+        # Generate a TTS audio so we have an audio file for merging.
+        audio_file = generate_audio("Test narration for merging with the Manim video.")
+        self.assertTrue(os.path.exists(audio_file), "TTS audio file for merging was not created.")
+        
+        # Call the service that writes code, renders video, and merges audio using Manim.
+        create_manim_video(video_data, dummy_code, audio_file=audio_file)
+        
+        # Allow enough time for Manim to finish rendering and merging.
+        time.sleep(10)
+        
+        # Try to find the output video.
+        video_paths = glob.glob("media/videos/generated_video/**/*.mp4", recursive=True)
+        if not video_paths:
+            # Fallback in case the output video is in the current directory.
+            self.assertTrue(os.path.exists("output.mp4"), "No video file was produced by Manim.")
+            # Add these additional test methods to your existing test classes:
+
+            def test_generate_audio_empty_text(self):
+                """Test TTS service with empty text input"""
+                with self.assertRaises(ValueError):
+                    generate_audio("")
+
+            def test_generate_audio_long_text(self):
+                """Test TTS with longer text input"""
+                long_text = "This is a longer test narrative. " * 10
+                output_file = generate_audio(long_text)
+                self.assertTrue(os.path.exists(output_file))
+                audio = AudioSegment.from_mp3(output_file)
+                self.assertGreater(audio.duration_seconds, 5)
+                os.remove(output_file)
+
+            def test_create_manim_video_without_audio(self):
+                """Test video creation without audio"""
+                dummy_code = """
+            class TestScene(Scene):
+                def construct(self):
+                    circle = Circle()
+                    self.play(Create(circle))
+                    self.wait(2)
+            """
+                video_data = {"output_file": "output.mp4", "manim_code": dummy_code}
+                create_manim_video(video_data, dummy_code)
+                
+                time.sleep(5)
+                video_paths = glob.glob("media/videos/generated_video/**/*.mp4", recursive=True)
+                self.assertTrue(video_paths, "No video file was produced")
+                
+                for f in video_paths:
+                    self.assertGreater(os.path.getsize(f), 0)
+                    os.remove(f)
+
+            def test_create_manim_video_invalid_code(self):
+                """Test handling of invalid Manim code"""
+                invalid_code = "This is not valid Python code"
+                video_data = {"output_file": "output.mp4", "manim_code": invalid_code}
+                with self.assertRaises(subprocess.CalledProcessError):
+                    create_manim_video(video_data, invalid_code)
+
+            def test_create_manim_video_with_text(self):
+                """Test video creation with text elements"""
+                code_with_text = """
+            class TextScene(Scene):
+                def construct(self):
+                    text = Text("Hello World")
+                    self.play(Write(text))
+                    self.wait(2)
+            """
+                video_data = {"output_file": "output.mp4", "manim_code": code_with_text}
+                create_manim_video(video_data, code_with_text)
+                
+                time.sleep(5)
+                video_paths = glob.glob("media/videos/generated_video/**/*.mp4", recursive=True)
+                self.assertTrue(video_paths)
+                
+                for f in video_paths:
+                    self.assertGreater(os.path.getsize(f), 0)
+                    os.remove(f)
+
+            def test_audio_video_sync(self):
+                """Test audio-video synchronization"""
+                dummy_code = """
+            class SyncScene(Scene):
+                def construct(self):
+                    circle = Circle()
+                    self.play(Create(circle), run_time=3)
+                    self.wait(2)
+            """
+                video_data = {"output_file": "output.mp4", "manim_code": dummy_code}
+                audio_text = "This circle appears over three seconds and then waits for two more seconds."
+                audio_file = generate_audio(audio_text)
+                
+                create_manim_video(video_data, dummy_code, audio_file=audio_file)
+                
+                time.sleep(10)
+                video_paths = glob.glob("media/videos/generated_video/**/*.mp4", recursive=True)
+                self.assertTrue(video_paths)
+                
+                # Clean up
+                for f in video_paths:
+                    os.remove(f)
+                os.remove(audio_file)