[FFmpeg-trac] #4138(ffmpeg:new): Lavfilter output cyclically the same frame when using trim filter with pipe

[FFmpeg]

#4138: Lavfilter output cyclically the same frame when using trim filter with pipe
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             Reporter:  olderz  |                     Type:  defect
               Status:  new     |                 Priority:  normal
            Component:  ffmpeg  |                  Version:  git-master
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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 Summary of the bug:
 How to reproduce:

 ffmpeg -i input -map 0:v -c:v rawvideo -f yuv4mpegpipe -vf
 trim=start_frame=240 - | x265 --input - --y4m --output output

 The output has cyclically the same frame. FFmpeg and x265 don't produce
 errors or warnings; if log is pretty necessary ask me and I'll provide to
 add it.
 However using this syntax the output works fine:

 ffmpeg -i input -map 0:v -c:v libx265 -vf trim=start_frame=240 output

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Ticket URL: <https://trac.ffmpeg.org/ticket/4138>
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