[FFmpeg-trac] #11231(undetermined:new): alphamerge complex filter delays video several seconds

[FFmpeg]

#11231: alphamerge complex filter delays video several seconds
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             Reporter:  degradox     |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by degradox):

 Sample and output files are all here:
 https://mega.nz/folder/YKAAGLiK#12KyX41EFsOMIXnMEYqCbA
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Ticket URL: <https://trac.ffmpeg.org/ticket/11231#comment:1>
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