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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" 


  


• rtl_fm piped to ffmpeg for udp stream

  4 novembre 2014, par user3936148

  rtl_fm piped to ffmpeg for udp stream

  Using Windows 7. I would like to pipe the rtl_fm standard out (pipe) to ffmpeg and udp stream it to an ip address. I have downloaded and installed rlt_sdr and other files and I have also installed sox. The console example given with the rtl_fm application using sox to play the radio station is below :

  rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 50 - | play -r 48000 -t s16 -L -c 1 -

  This works great, using sox.

  Update :

  Below works with ffplay sounds ok not great..

  rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 80- | ffplay -f s16le -ar 48000 -ac 1 -

  I would like to use ffmpeg instead, below is a non working example (just to give you an idea)

  rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 50 - | ffmpeg -i - -f s16le -ar 48000 -ac 1 -acodec libmp3lame -ab 24k -ar 22050 -f mpegts udp ://192.168.1.196:1234 -

  useful links :

  http://kmkeen.com/rtl-demod-guide/

  http://sdr.osmocom.org/trac/wiki/rtl-sdr

  Thank you for your help

• Concatenating multiple remote files using ffmpeg ?

  8 décembre 2018, par May Rest in Peace

  I am trying to concatenate multiple remote files using ffmpeg but some files get skipped in the output.

  I use the command

  ffmpeg -f concat -safe 0 -protocol_whitelist "file,http,https,tcp,tls" -i mylist.txt -c copy output.m4a

  mylist.txt looks like :

  file 'http://remoteurl?fileName=20.m4a'
  
  file 'http://remoteurl?fileName=21.m4a'
  
  file 'http://remoteurl?fileName=22.m4a'
  
  file 'http://remoteurl?fileName=23.m4a'

  On running this command, the output will contain audio from only some files.

  I download the files individually from the same urls and did a local concatentation using the same command and it worked perfectly.

  Is this because concat will not work if files are not present immediately as mentioned in https://trac.ffmpeg.org/wiki/Concatenate#Automaticallyappendingtothelistfile ?

  If that’s the case then how should I proceed ? There’s a terminal script provided in the above link but I am on a Windows machine and tbh, I am not that good at bash scripting.

  All files are audio files with same bitrate and are in .m4a format.

  This is the error message I receive [mov,mp4,m4a,3gp,3g2,mj2 @ 00000278b64d4f40] stream 0, offset 0xc9b: partial file