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• vaapi_encode_mpeg2 : Fix setting colour properties

  2 novembre 2020, par Mark Thompson

  vaapi_encode_mpeg2 : Fix setting colour properties
  Follow the same pattern as the previous commits for H.264 and H.265.
  Reviewed-By : Jan Ekström <jeebjp@gmail.com>
  
  Tested-By : Xu, Yefeng <yefengx.xu@intel.com>
  

  • [DH] libavcodec/vaapi_encode_mpeg2.c

• avcodec/decode : use a packet list to store packet properties

  17 août 2020, par James Almer

  avcodec/decode : use a packet list to store packet properties
  Keeping only the latest packet fed to the decoder works only for decoders that
  
  return a frame immediately after every consumed packet. Decoders that consume
  
  several packets before they return a frame will fill said frame with properties
  
  taken from the last consumed packet instead of the earliest.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/decode.c
  • [DH] libavcodec/internal.h
  • [DH] libavcodec/utils.c

• How to use ffmpeg to change the h264 properties, yuv, fps, tbr, tbn, and tbc of an mp4 file ?

  23 août 2020, par bguiz

  Using ffmpeg, I would like to convert a video file such that its video stream changes like so :

  


  

  • Current video stream : Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 2560x1080 [SAR 4:3 DAR 256:81], 60 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)

  


  • Target video stream : Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 2560x1080, 272 kb/s, 20 fps, 20 tbr, 10240 tbn, 40 tbc (default)

  


  


  (values that differ : h264 properties, yuv, fps, tbr, tbn, and tbc)

  


  ... and its audio stream changes like so :

  


  

  • Current audio stream : Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 191 kb/s (default)

  


  • Target audio stream : Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s (default)

  


  


  (values that differ : aac properties)

  


  How can I do this ?

  


  ---

  


  Detailed version

  


  I would like to be able to concatenate, without re-encoding, main.mp4, followed by outro.mp4, using the following commands :

  


  echo "file 'main.mp4'" > concat.txt
echo "file 'outro.mp4'" >> concat.txt
ffmpeg \
  -f concat \
  -safe 0 \
  -i concat.txt \
  -c copy \
  concat.mp4


  


  What results is a file which plays till the end of main.mp4, and then the video freezes, and I hear the audio of outro.mp4. The same video frame then stays on, with no sound, for an extra 30 minutes (end time shown in VLC).

  


  My assumption is that these files are incompatible with each other in some way that prevents them from being concatenated using -codec copy (without re-encoding).

  


  Here is the ffprobe output for main.mp4 :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'main.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 01:13:00.65, start: 0.000000, bitrate: 348 kb/s
    Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 2560x1080, 272 kb/s, 20 fps, 20 tbr, 10240 tbn, 40 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  


  Here is the ffprobe output for outro.mp4 :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'outro.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:04.12, start: 0.000000, bitrate: 254 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 2560x1080 [SAR 4:3 DAR 256:81], 60 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
      handler_name    : Stereo


  


  How can I convert outro.mp4, such that I may concatenate the files without re-encoding ?

  


  Note that I am OK with re-encoding the outro.mp4 on its own,
I simply want to avoid re-encoding during the concatenation step,
and avoid re-encoding main.mp4.

  


  ---

  


  ffmpeg build

  


  $ ffmpeg -version
ffmpeg version 4.3-2~18.04.york0 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --prefix=/usr --extra-version='2~18.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libavresample   4.  0.  0 /  4.  0.  0
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100