[FFmpeg-trac] #6494(ffmpeg:new): Concat'ing HEVC streams with different encoding parameters produces gibberish

FFmpeg trac at avcodec.org
Wed Jun 28 12:52:45 EEST 2017


#6494: Concat'ing HEVC streams with different encoding parameters produces
gibberish
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             Reporter:  birdie        |                    Owner:
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  ffmpeg
              Version:  git-master    |               Resolution:
             Keywords:  concat, hevc  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by heleppkes):

 The concat filter works on decoded streams, so you can re-encode them all
 into a common format, it does not allow using the original streams as-is.

 To elaborate some, while it would in theory be possible to make those
 files somewhat playable and seekable (at least by avcodec, who knows what
 other decoders might think), it requires rewriting the bitstreams to
 adjust the SPS/PPS/VPS ids and whatnot, which is at this point out of
 scope for the concat demuxer - its specifically documented to require
 compatible streams.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6494#comment:4>
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