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• FFMPEG problem with concat outpoint option

  8 juillet 2021, par DavidB

  Trying to concatenate MP4 files

  


  ffmpeg -f concat -i c.txt -c copy concat.mp4


  


  c.txt file content

  


  ffconcat version 1.0
file first.mp4
outpoint 55000.0
file sec.mp4


  


  it is done but takes a too long time, and during processing throws a lot of errors

  


  [mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266868961 / timestamp: 2425630048 is out of range for mov/mp4 format
[mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266869984 / timestamp: 2425631072 is out of range for mov/mp4 format
[mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266871007 / timestamp: 2425632096 is out of range for mov/mp4 format
[mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266872030 / timestamp: 2425633120 is out of range for mov/mp4 format
[mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266873053 / timestamp: 2425634144 is out of range for mov/mp4 format

frame=111223 fps=11907 q=-1.0 Lsize=   19922kB time=15:18:27.42 bitrate=   3.0kbits/s speed=5.9e+03x
video:14229kB audio:2597kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 18.403999%


  


  I noticed that somehow it depends on file size or duration (e.g. if outpoint is 50000.0 it is ok and no errors) but I cannot get what is the exact problem.

  


• lavc/qsvenc : update the selection of bitrate control method

  1er février 2024, par Haihao Xiang

  lavc/qsvenc : update the selection of bitrate control method
  The default method is changed to CQP
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] Changelog
  • [DH] doc/encoders.texi
  • [DH] libavcodec/qsvenc.c
  • [DH] libavcodec/qsvenc_av1.c
  • [DH] libavcodec/qsvenc_h264.c
  • [DH] libavcodec/qsvenc_hevc.c
  • [DH] libavcodec/qsvenc_mpeg2.c
  • [DH] libavcodec/qsvenc_vp9.c

• Rate-Control management in ffmpeg

  28 février 2014, par alexbuisson

  Hi I try to understand how ffmpeg wrap its rc_max_rate parameters to the x264 parameters
  and I'm wondering what the following code means ? It's a piece of code coming from ffmpeg/libavcodec/mpeg_video_enc.c but the commit log is not explicit and I don't know from where those Magic Number come from !

  So if you have an idea or an URL that can explain why those formula where implemented, it will be useful.

  if (avctx->rc_max_rate && !avctx->rc_buffer_size) {
  
          switch(avctx->codec_id) {
  
          case AV_CODEC_ID_MPEG1VIDEO:
  
          case AV_CODEC_ID_MPEG2VIDEO:
  
              avctx->rc_buffer_size = FFMAX(avctx->rc_max_rate, 15000000) * 112L / 15000000 * 16384;
  
              break;
  
          case AV_CODEC_ID_MPEG4:
  
          case AV_CODEC_ID_MSMPEG4V1:
  
          case AV_CODEC_ID_MSMPEG4V2:
  
          case AV_CODEC_ID_MSMPEG4V3:
  
              if       (avctx->rc_max_rate >= 15000000) {
  
                  avctx->rc_buffer_size = 320 + (avctx->rc_max_rate - 15000000L) * (760-320) / (38400000 - 15000000);
  
              } else if(avctx->rc_max_rate >=  2000000) {
  
                  avctx->rc_buffer_size =  80 + (avctx->rc_max_rate -  2000000L) * (320- 80) / (15000000 -  2000000);
  
              } else if(avctx->rc_max_rate >=   384000) {
  
                  avctx->rc_buffer_size =  40 + (avctx->rc_max_rate -   384000L) * ( 80- 40) / ( 2000000 -   384000);
  
              } else
  
                  avctx->rc_buffer_size = 40;
  
              avctx->rc_buffer_size *= 16384;
  
              break;
  
          }
  
          if (avctx->rc_buffer_size) {
  
              av_log(avctx, AV_LOG_INFO, "Automatically choosing VBV buffer size of %d kbyte\n", avctx->rc_buffer_size/8192);
  
          }
  
      }