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• Detect frame with incorrect poc

  3 août 2018, par Анзор Гергов

  When I try to decode packet (using this function avcodec_decode_video2) sometimes I get corrupt (gray) frame. This error is obtained because of the missed frames. ffmpeg shoes the following errors to the log :

  [hevc @ 000000000379b680] Could not find ref with POC 43 [hevc @
  000000000379b1c0] Duplicate POC in a sequence : 17. [hevc @
  000000000379b1c0] Error parsing NAL unit #0.

  I wanted to solve this problem by strictly adjusting the context of the decoder using the following flags : AV_EF_EXPLODE and AV_EF_AGGRESSIVE. Unfortunatly it didn’t help, errors continue appear in log, but avcodec_decode_video2 gives away corrupt frame.

  AVCodecContext* context = avcodec_alloc_context3(codecId);
  
  avctx->flags2 |= AV_CODEC_FLAG2_FAST;
  
  
  
  // Known encoder's bugs handling.
  
  avctx->workaround_bugs = AV_EF_EXPLODE | AV_EF_AGGRESSIVE;
  
  avctx->err_recognition = 0;
  
  avctx->error_concealment = 0;
  
  
  
  // Threads.
  
  avctx->thread_count = 4;
  
  avctx->thread_type = FF_THREAD_FRAME;
  
  .....
  
  avcodec_decode_video2(avctx, picture, got_picture_ptr, avpkt);
  
  ....

  What do I need to do to ensure that corrupted frames are not repeated ? Maybe I need to configure the context a little differently ?

  P.S. you can see ffmpeg version in attachment

• concealing 8160 DC, 8160 AC, 8160 MV errors in frame error in ffmpeg

  18 mars 2019, par Talia

  I have an mp4 video and I want to convert it to yuv. This video has some errors inside. I need to convert it to yuv because the target is getting PSNR between the distorted yuv and the original yuv.

  I am using FFmpeg for this purpose. I get several of the consecutive following error :

  [h264 @ 0x1c0ce00] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
  
  [h264 @ 0x1bce920] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
  
  [h264 @ 0x1be2c80] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
  
  frame=14964 fps= 31 q=-0.0 size=45453150kB time=00:09:58.56 
  
  bitrate=622080.0kbit[h264 @ 0x1b482a0] concealing 8160 DC, 8160 AC, 8160 MV 
  
  errors in I frame
  
  [h264 @ 0x1be9780] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
  
  [h264 @ 0x1b827a0] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
  
  [h264 @ 0x1b89ee0] concealing 8160 DC, 8160 AC, 8160 MV errors in P frame

  Then, in the converted yuv video, these frames are the gray scenes while these frames are fine in the mp4 video. So, I am wondering why FFmpeg can’t convert them to yuv.
  I am using the following command to convert mp4 to yuv :

  ffmpeg -i d_video.mp4 -c:v rawvideo -pix_fmt yuv420p -r 25  -s 1920x1080 -y d_yuv.yuv

  could you please guide me ?

• ffmpeg Unrecognized option 'vcodec libx264'

  8 septembre 2021, par Mike

  I have a lambda that is trying to transcode webm files to mp4. It his the lambda using the following code to do the conversion :

  


  const args = [
    "-i",
    inputFilename,
    "-vcodec libx264",
    "-r 30",
    "-y",
    mp4Filename,
];


try {
    const { error, output } = spawnSync(ffmpeg, args);
    console.log(`output: ${output}`);
    console.log(`error: ${error}`);
} catch (error) {
    console.log("ffmpeg failed...");
    console.log(error);
}


  


  In my lambda, I'm seeing the following error :

  


  output: ,,ffmpeg version 4.2.2-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Unrecognized option 'vcodec libx264'.
Error splitting the argument list: Option not found

2021-09-08T15:19:46.644Z 9477062f-6afa-4a94-9900-6b28337d8c2a INFO output: ,,ffmpeg version 4.2.2-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2019 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavdevice 58. 8.100 / 58. 8.100 libavfilter 7. 57.100 / 7. 57.100 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 libpostproc 55. 5.100 / 55. 5.100 Unrecognized option 'vcodec libx264'. Error splitting the argument list: Option not found


  


  I'm using ffmpeg-4.2.2-amd64-static