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• FFMPEG throwing error nb_cpb invalid, what went wrong ?

  21 août 2023, par qkhanhpro

  I am trying to play with this file from Kodi sample page https://kodi.wiki/view/Samples

  


  


  HDR10+ Profile A HEVC 10-bit 23.976 Sample (in MKV with DTS:X audio)

  


  


  The ffmpeg command throw this error on every line, with the number always being 93 for multiple different output video codec

  


  nb_cpb 93 invalid.0 q=0.0 size=       0kB time=00:00:00.65 bitrate=   0.5kbits/s speed=3.95x  


  


  A search point to this source file https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/hevc_ps.c

  


  if (!hdr->flags.low_delay_hrd_flag) {
    hdr->cpb_cnt_minus1[i] = get_ue_golomb_long(gb);
    if (hdr->cpb_cnt_minus1[i] > 31) {
        av_log(NULL, AV_LOG_ERROR, "nb_cpb %d invalid\n",
               hdr->cpb_cnt_minus1[i]);
        return AVERROR_INVALIDDATA;
    }
}


  


  What went wrong ?

  


  ffmpeg -i E:\HDR.mkv -c:v libx265 -c:a copy "HDR.mp4" 

ffmpeg -i E:\HDR.mkv -c:v hevc_nvenc -c:a copy "HDR.mp4" 


  


• How to Play Smooth 4K Video with FFplay ? [closed]

  14 mai 2020, par Matan Marciano

  Im trying to play 4K video with ffplay and the video is not smooth.

  



  Video File :

  



  

  • Big Buck Bunny, 4K, 60fps, 30Mbps

  


  • http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_2160p_60fps_stereo_abl.mp4

  


  



  Hardware :

  



  

  • Dell OptiPlex 7070 Micro (8 Cores, 8GB RAM, GPU : Intel Corporation UHD Graphics 630)

  


  • Samsung U28E590D, 4K Screen

  


  • DisplayPort to HDMI Cable

  


  



  Software :

  



  

  • Ubuntu 19.04

  


  • ffplay with libmvx (according this guide : https://github.com/Intel-Media-SDK/MediaSDK/wiki/Build-and-use-ffmpeg-with-MediaSDK)

  


  



  The FFplay command I used is : ffplay -vcodec h264_qsv -i input.ts

  



  

  • Notes :

  


  • During the playing, my CPU usage is around 25% (according to 'top' command)

  


  • FFplay logs indicate on many frame drops

  


  • I also tried VLC and MPV player's- VLC looks bad also. MPV player looks better but still not smooth.

  


  



  So, its looks like my hardware is good enough for 4K playing. What am I missing ?
How can I play smooth 4K video via FFplay ?

  


• How to install ffmpeg on linux(CentOs 6.8) dedicated server [on hold]

  27 septembre 2016, par Kiran Pardeshi

  I am trying to install ffmpeg on linux(CentOs 6.8) dedicated server.
  I used below links for reference but could not succeed.

  https://www.webhostpython.com/billing/knowledgebase.php?ction=displayarticle&id=10

  https://chrisjean.com/install-ffmpeg-and-ffmpeg-php-on-centos-easily/

  http://wiki.razuna.com/display/ecp/FFMpeg+Installation+on+CentOS+and+RedHat

  Please suggest me how to install ??