[FFmpeg-trac] #7913(avformat:new): Muxing SVT-AV1 output via -vcodec copy into webm resulted in badly seekable files

[FFmpeg]

#7913: Muxing SVT-AV1 output via -vcodec copy into webm resulted in badly seekable
files
------------------------------------+------------------------------------
             Reporter:  Andrew-R    |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  mkv av1     |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+------------------------------------
Changes (by jamrial):

 * keywords:  mov av1 => mkv av1
 * component:  undetermined => avformat


Comment:

 The issue, if any, is not in the muxer but in the demuxer instead. Using
 mkvtoolnix to remux the sample creates a matroska file with the same
 issues during seeking. The "Element exceeds containing master element"
 spam is unrelated.

 out-1.ivy has a single keyframe, and both libavformat and mkvtoolnix
 create a single Cue element for it. I'm not sure if our demuxer and/or
 ffplay is capable of seeking to arbitrary positions without cues, so that
 may be the problem. A sample with a single key frame in any case will not
 get smooth seeking on anything.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7913#comment:4>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker