[FFmpeg-trac] #5354(avfilter:new): Concat filter breaks alpha overlay

[FFmpeg]

#5354: Concat filter breaks alpha overlay
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             Reporter:  d-fens_      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  overlay      |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by cehoyos):

 Replying to [comment:4 d-fens_]:
 > is the {{{overlay=format=yuv420}}} syntax as noted in the docs not valid
 anymore?
 To the best of my knowledge this syntax is valid.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5354#comment:5>
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