[FFmpeg-trac] #6997(ffmpeg:open): Last image of the sequence is not shown in the generated video in case it is monochrome and goes after colored image

[FFmpeg]

#6997: Last image of the sequence is not shown in the generated video in case it
is monochrome and goes after colored image
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  andriy_lobashchuk                  |                   Status:  open
                 Type:  defect       |                Component:  ffmpeg
             Priority:  important    |               Resolution:
              Version:  git-master   |               Blocked By:
             Keywords:  concat fps   |  Reproduced by developer:  1
  regression                         |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:  concat, fps, demuxer => concat fps regression
 * priority:  critical => important
 * version:  3.4 => git-master
 * status:  new => open
 * reproduced:  0 => 1


Comment:

 For future tickets: Please remember to always test current FFmpeg git head
 before reporting an issue.

 Regression since 9f6d48d696d679de77e8cb513d5f64cd708ed86f, related to
 tickets #1578 and #4119.

 Work-around is to use `-r 30`.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6997#comment:2>
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