[FFmpeg-trac] #8431(undetermined:new): -frames on 2 image streams discards 1 frame

[FFmpeg]

#8431: -frames on 2 image streams discards 1 frame
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             Reporter:  Zenitram     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Zenitram):

 > Duration in multimedia files is measured in time (seconds etc.), number
 of frames is another property of video files. Please elaborate what kind
 of issue you see.

 Expected frame count is 2 frames (same frame count as the 1st stream) as
 2nd and 1st outputted streams have the same input stream.
 Issue is visible by e.g checking the duration output (stream duration is
 frame duration time count or frames) or by checking the count of frames in
 the output file (check of the file directly or demux to image content).

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Ticket URL: <https://trac.ffmpeg.org/ticket/8431#comment:2>
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