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• How can I pass chapter data to multiple streams with tee muxer

  11 février 2021, par jonnywishbone

  I'm trying to transcode several videos from their original format into 4K and 1080p HD MKV and/or MP4 containers. The original contains chapter info, but no matter how many incarnations of ffmpeg flags/settings I've tried, the chapter data doesn't wind up in either output stream.

  


  Here's a redacted version of the command I'm using (PowerShell 7.1) :
...

  


     ffmpeg -i "XXXXXxxxx.mkv" `
   -loglevel repeat+warning -stats  -hide_banner -y -benchmark `
   -flags +global_header -filter_complex `
   "[0:v]split=2[s0][s1]; `
   [s0]null[v2160]; [s1]scale=1920:-1[v1080]" `
   -to 00:01:05 -map "[v2160]" -map "[v1080]"  -map 0:1 -map_metadata 0 -map_chapters 0 -movflags use_metadata_tags `
   -c:v libx265  -x265-params  `
   "log-level=error" -pix_fmt yuv420p10le   `
  -b:v:0 3100K -b:v:1 2200K -minrate 400K -bufsize 8M  `
   -c:a:0 aac  -ac:a:0 2   -ar:a:0 48000 -af:a:0 dynaudnorm  -b:a:0 192k -disposition:a:0 default+original `
   -metadata:s:a:0 language=eng -metadata:s:a:0 title="aac-stereo" -metadata:s:a:0 handler="aac-stereo" `
   -metadata comment=" "  -metadata title=""XXXXXxxxx"  `
   -f tee "[select=\'v:0,a\':f=matroska]`""XXXXXxxxx [2160p].mkv`"|[select=\'v:1,a\':f=matroska]`""XXXXXxxxx [1080p].mkv`""


  


  ...

  


  What's the secret sauce for getting chapter info passed to the output streams ? Is it a tee select of some sort ? A different -map_metadata -type setting ?

  


  Please forgive the odd code formatting - the editor really didn't know what to do with PowerShell back-tick escape characters that delimit quotes and other literals in PS scripting !

  


• avformat/matroskaenc : Check chapter ids for duplicates

  15 mars 2021, par Andreas Rheinhardt

  avformat/matroskaenc : Check chapter ids for duplicates
  Up until now, there has been no check that each chapter has a unique id ;
  
  there was only a check for whether a chapter id is zero (this happens
  
  often when the chapters originated from a format that lacks the concept
  
  of chapter id and simply counts from zero) which is invalid in Matroska.
  
  In this case the chapter ids are offset by 1 to make them nonnegative.
  
  Yet offsetting won't fix duplicate ids, therefore this is changed to
  
  simply create new chapter uids when the input chapter uids don't conform
  
  to the requirements of Matroska (in which case it can be presumed that
  
  they did not originate from Matroska, so that we don't need to bother
  
  to preserve them).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• lavc/pngdec : use a separate bytestream reader for each chunk

  2 avril 2021, par Anton Khirnov

  lavc/pngdec : use a separate bytestream reader for each chunk
  This makes sure that reading a truncated chunk will never overflow into
  
  the following chunk. It also allows to remove many repeated lines
  
  skipping over the trailing crc checksum.
  

  • [DH] libavcodec/pngdec.c