[FFmpeg-trac] #4774(avformat:new): Incompatibilities between XBMC/Kodi & mkvalidator relating to how FFmpeg muxes MKVs

FFmpeg trac at avcodec.org
Wed Aug 26 00:05:04 CEST 2015 

#4774: Incompatibilities between XBMC/Kodi & mkvalidator relating to how FFmpeg
muxes MKVs
-------------------------------------+-------------------------------------
             Reporter:  Drag0nFly    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mkv          |               Blocked By:
  timecode chapters regression       |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by Drag0nFly):

 @cehoyos–thanks for the patch. I've performed a few tests, and there is
 noticeable improvement.

 Test #1; remuxing:

 $ time mkvalidator /data/video/work/delete/remux-test.mkv

 mkvalidator 0.5.0: the file appears to be
 valid...............................
         file created with Lavf56.40.101 / Lavf56.40.101

 real    2m13.683s
 user    0m5.963s
 sys     0m0.990s

 No errors introduced. Playback tested with Kodi, and chapters do not
 repeat.

 Test #2:

 Audio re-encode+mux:

 $ time mkvalidator /data/video/work/delete/volnorm+mux.mkv

 mkvalidator 0.5.0: the file appears to be
 valid...............................
         file created with Lavf56.40.101 / Lavf56.40.101

 real    1m0.539s
 user    0m6.188s
 sys     0m2.430s


 Test #3: re-encode of problematic segment:

 Curiously, this throws repeated 'is not a keyframe' errors but the
 resulting file does not have the issue with the cue/timestamps (or the
 playback issues), as the file plays fine w/o repeating chapters.

 {{{

 $ time mkvalidator /data/video/work/hot.shots.sample.fullq-crf17-slow-
 custom.mkv
 ERR0B1: Block at 20972936 track #4 is not a keyframe
 ERR0B1: Block at 22992776 track #4 is not a keyframe
 ERR0B1: Block at 289127174 track #4 is not a keyframe
 ERR0B1: Block at 289152374 track #5 is not a keyframe
 ERR0B1: Block at 289323676 track #6 is not a keyframe
 ERR0B1: Block at 299088925 track #3 is not a keyframe
 ERR0B1: Block at 304458824 track #5 is not a keyframe
 ERR0B1: Block at 304594796 track #4 is not a keyframe
 ERR0B1: Block at 304594837 track #6 is not a keyframe
 ERR0B1: Block at 304731589 track #5 is not a keyframe
 ERR0B1: Block at 308588380 track #4 is not a keyframe
 ERR0B1: Block at 308869792 track #6 is not a keyframe
 ERR0B1: Block at 311392555 track #5 is not a keyframe
 ERR0B1: Block at 313860986 track #3 is not a keyframe
 ERR0B1: Block at 314407585 track #3 is not a keyframe
 ERR0B1: Block at 315259632 track #4 is not a keyframe
 ERR0B1: Block at 315391193 track #6 is not a keyframe
 ERR0B1: Block at 315531160 track #4 is not a keyframe
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 ERR0B1: Block at 315846161 track #6 is not a keyframe
 ERR0B1: Block at 321766632 track #3 is not a keyframe
 ERR0B1: Block at 322885059 track #4 is not a keyframe
 ERR0B1: Block at 322885100 track #5 is not a keyframe
 ERR0B1: Block at 323006412 track #6 is not a keyframe
 ERR0B1: Block at 325021145 track #3 is not a keyframe
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 ERR0B1: Block at 340944479 track #6 is not a keyframe
 ERR0B1: Block at 348071176 track #3 is not a keyframe
 ERR0B1: Block at 349502214 track #4 is not a keyframe
 ERR0B1: Block at 349502255 track #5 is not a keyframe
 ERR0B1: Block at 349748686 track #6 is not a keyframe
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 ERR0B1: Block at 513638422 track #6 is not a keyframe
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 ERR0B1: Block at 519070749 track #4 is not a keyframe
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 .....   file created with Lavf56.40.101 / Lavf56.40.101

 real    0m15.592s
 user    0m0.270s
 sys     0m0.465s
 }}}

 So you are definitely on the right track. As expected, the change does
 introduce issues with seeking (takes a few seconds for video to sync up
 for certain chapters)

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4774#comment:26>
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