[FFmpeg-trac] #3192(undetermined:new): Dropped frames if v4l2 and x11grab are used in filter_complex (was: x11grab drops frames if overlay filter is used)

[FFmpeg]

#3192: Dropped frames if v4l2 and x11grab are used in filter_complex
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             Reporter:  ian_m        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  x11grab      |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by jnvsor):

 Changing the title since it can be reproduced without overlay, it just so
 happens overlay requires both streams to be passed through filter_complex
 which seems to be closer to the root of the problem

 {{{
 ffmpeg \
 -f x11grab -i :0.0 \
 -f v4l2 -i /dev/video0 \
 -filter_complex '[0]null[cap];[1]null[webcam]' \
 -map '[cap]' -map '[webcam]' \
 -c:v libx264 -y out.mkv
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3192#comment:13>
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