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Where to download avcodec.dll ? [closed]

29 juin, par Олег Ю.

I see in the folder of some application FFMPEG files avcodec.dll, avformat.dll, avutil.dll, etc. They are all old version of FFMPEG. I wanted to update them, but I did not find where to download them on the FFMPEG website. Are these complete libraries available for download? Or do they exist only in development files and the authors of some application create FFMPEG .dll files themselves? In other words, avcodec.dll files from different applications are not interchangeable? Help me figure it out.

Manim Animation Rendering Fails on Google Cloud Run : Segment Combination Issues [closed]

28 juin, par Ahaskar Kashyap

Problem Summary

I'm running a Manim animation server on Google Cloud Run that successfully creates video segments but fails during the FFmpeg combination step. The behavior is inconsistent based on the number of segments created.

Environment

Platform: Google Cloud Run (8GB RAM, 4 CPU)
Container: Debian 12 (bookworm) with Python 3.9.23
FFmpeg: 5.1.6 (with h264 support enabled)
Manim: Latest version with -ql (480p15) quality setting
Timeout: 240 seconds

Observed Behavior

Animation Complexity	Segments Created	Final Video	Status
Simple (2 segments)	✅ Success	✅ Created (7,681 bytes)	❌ Reports "failed"
Complex (8+ segments)	✅ Success	❌ Not created	❌ Actually fails

Code Structure

# Manim command used
manim_cmd = [
    'manim', python_file, scene_class,
    '--media_dir', output_dir,
    '-ql',  # Low quality (480p15)
    '--disable_caching',
    '--output_file', f"{output_filename}.mp4",
    '--verbosity', 'ERROR',
    '--progress_bar', 'none',
    '--write_to_movie'
]

Specific Issues

Issue 1: False Negatives (Simple Animations)

What happens: Manim creates 2 segments successfully, FFmpeg combines them into final video
Problem: Final video exists and is playable, but process reports "Manim failed (code 1)"
Evidence: Can download the "failed" video via /videos/filename.mp4 and it plays correctly

Issue 2: Real Failures (Complex Animations)

What happens: Manim creates 8+ segments successfully
Problem: FFmpeg combination step genuinely fails, no final video created
Error: Process exits with code 1, only partial segments remain

Key Questions

Why does FFmpeg combination work for 2 segments but fail for 8+ segments?
Why does the same code work locally but fail on Cloud Run?
Is this a Cloud Run container limitation, FFmpeg configuration issue, or Manim-specific problem?
How can I debug FFmpeg combination failures in a containerized environment?

File Structure (When Working)

/app/manim_animations/
└── animation_name/
    └── videos/
        └── animation_name_1234/
            └── 480p15/
                ├── partial_movie_files/
                │   └── SceneClass/
                │       ├── uncached_00000.mp4
                │       └── uncached_00001.mp4
                └── final_animation.mp4  # This gets created for 2 segments

Error Output

🔒 ISOLATED: Manim return code: 1
Manim failed (code 1): [stderr contains FFmpeg errors]

Has anyone encountered similar issues with Manim + FFmpeg on Cloud Run or other containerized environments? Any insights into why segment count affects combination success would be greatly appreciated.

Investigation Results

What Works:

✅ Local development (identical code works perfectly)
✅ FFmpeg installation (ffmpeg -version works, h264 encoders available)
✅ Segment creation (all uncached_*.mp4 files created with correct sizes)
✅ Simple animations after container restart

What Doesn't Work:

❌ Segment combination for 8+ segments
❌ Status detection for 2-segment animations
❌ Animations after multiple renders (resource accumulation?)

Theories Tested:

Resource constraints: Upgraded to 16GB/8CPU - made things worse
FFmpeg version: Upgraded 5.1.6→7.x - broke basic functionality
File accumulation: Container restart helps temporarily
Path detection: Isolation script may look in wrong directories

I can't understand how to use ffmpeg in javascript (if it's even possible)

28 juin, par Laimonas Rupeika
Straight to the problem, I want to use ffmpeg in my javascript project for video editing. So I found cdn: <script src="https://cdn.jsdelivr.net/npm/@salomvary/ffmpeg.js-umd@3.1.9001/ffmpeg-mp4.min.js"></script> which references to "https://github.com/Kagami/ffmpeg.js", which is ffmpeg port to javascript as I understand? I don't get any errors on import, but if I try loading ffmpeg:
```
// Initialize FFmpeg after the GAPI client is loaded
  const ffmpeg = createFFmpeg({ log: true });

  // // Load the FFmpeg library
  await ffmpeg.load();
```
I get error: Uncaught (in promise) ReferenceError: createFFmpeg is not defined at initializeGapiClient (index:89:18) and it also messes my whole project. So if possible, how can I use ffmpeg in pure javascript, not Node.js. Should I download ffmpeg library files and then include them in project, I'm totally lost at this.
ffplay video playing with slider where i can slider to any position of the video

27 juin, par Eswar T

is it possible to slide to a specific location of video in FFplay?

Like how we do in VLC when we open a video a slider will be a bottom using which we can move to any part of the video is it possible in ffplay? using either commands or any GUI
Camera2 API switching camera during recording

27 juin, par Max Efimov

I'm working with Camera2 API and in my app it's important to switch the camera during recording. After each camera switch I save video fragment to disk, and after stopping the recording I merge videos into one using -f concat -safe 0 -i listPath -c copy finalPath command of FFmpeg for Android. When I open a separate video fragment, it looks correct, but when I open the merged video, videos recorded on the back camera are rotated 180 degrees. The problem is only in the merged video.

In meta-tag of videos if video recorded on back camera, then "rotate" tag has 90 degrees, otherwise 270 degrees.

As I understood when ffmpeg merges a videos it automatically rotates the video if it has different "rotate" tag in he's metatags.

How I can solve this problem?

P.S Also I tried to use MP4Parser Library for merging, but it has the same problems.
P.P.S. -noautorotate param for ffmpeg does not help me.