[FFmpeg-trac] #2138(avformat:open): this video is not segmented correct

[FFmpeg]

#2138: this video is not segmented correct
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             Reporter:  mpapp       |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  segment     |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  1           |
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Comment (by saste):

 Replying to [comment:8 mpapp]:
 > I guess there could be a double reference mode.

 > In which ,both stream could be watched.

 No idea what you mean.

 > Whichever changes most that one should be used as a reference for that
 segment.

 This in not well defined. Also you broke video segmenting if you use audio
 as reference for an input with audio and video, for a normal video which
 comprises more than one keyframe (like in your case).

 > I guess the problem is if I use sound as a reference, and there is no
 sound or it does not change, I will bump into the same phenomena, do not
 you think?

 You can script things (e.g. with ffprobe), see what streams your input
 contains and change the -reference_stream value accordingly.
 Alternatively, I could change the default so that in case the video is an
 "attached picture" it is not used as a reference.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2138#comment:9>
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