-2 opencv runtime_error ai_generated partial

cv2.error: OpenCV(4.8.0) /modules/videoio/src/cap_images.cpp: error: (-2:Unspecified error) could not find encoder for codec 0x47504A4D

ID: opencv/video-writer-codec-not-found

Also available as: JSON · Markdown · 中文
75%Fix Rate
88%Confidence
1Evidence
2023-06-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
4.6.0 active — — —
4.7.0 active — — —
4.8.0 active — — —
4.9.0 active — — —

Root Cause

The specified codec (e.g., MJPG, H264) is not supported by the installed FFmpeg or encoder backend on the system.

generic

中文

指定的编解码器（例如 MJPG、H264）不被系统上安装的 FFmpeg 或编码器后端支持。

Official Documentation

https://docs.opencv.org/4.x/dd/d9e/classcv_1_1VideoWriter.html

Workarounds

  1. 80% success List available encoders with 'ffmpeg -encoders' and use a codec that appears in the list. Common working codecs: 'mp4v' (for MP4), 'XVID' (for AVI), 'MJPG' for motion JPEG. 
    List available encoders with 'ffmpeg -encoders' and use a codec that appears in the list. Common working codecs: 'mp4v' (for MP4), 'XVID' (for AVI), 'MJPG' for motion JPEG.
  2. 70% success Install a more complete FFmpeg build (e.g., from conda-forge or compile with --enable-libx264) to add missing codecs. 
    Install a more complete FFmpeg build (e.g., from conda-forge or compile with --enable-libx264) to add missing codecs.

中文步骤

  1. List available encoders with 'ffmpeg -encoders' and use a codec that appears in the list. Common working codecs: 'mp4v' (for MP4), 'XVID' (for AVI), 'MJPG' for motion JPEG.
  2. Install a more complete FFmpeg build (e.g., from conda-forge or compile with --enable-libx264) to add missing codecs.

Dead Ends

Common approaches that don't work:

  1. Reinstall OpenCV with --with-ffmpeg flag 65% fail

    The issue is not build-time but runtime; FFmpeg may be installed but the specific codec might be missing or disabled in the FFmpeg build.

  2. Change codec ID to a random fourcc code 90% fail

    Random codecs are even less likely to be supported; must use a codec known to work with the installed FFmpeg.

  3. Use .avi extension instead of .mp4 50% fail

    The extension does not determine the codec; the fourcc code must match a supported encoder.