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

[FFmpeg]

#5354: Concat filter breaks alpha overlay
-------------------------------------+-------------------------------------
             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            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:   => overlay regression
 * version:  unspecified => git-master
 * component:  undetermined => avfilter
 * reproduced:  0 => 1


Comment:

 Could be considered a regression since
 13c62525362595cc914161aaa192953dd9077233 related to ticket #549, work-
 around is to use `overlay,format=yuv420p` but I am not sure if there is
 anything to fix, the filter system is not clairvoyant.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5354#comment:3>
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