[FFmpeg-trac] #2559(avfilter:new): Bad pixel format negociation with scale and gray

[FFmpeg]

#2559: Bad pixel format negociation with scale and gray
------------------------------------+------------------------------------
             Reporter:  ubitux      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+------------------------------------

Comment (by Cigaes):

 cehoyos is right, the behaviour is normal.

 The auto-inserted filters are on the pad-overlay and edgedetect-overlay
 links, they are completely unrelated to the problem at hand, which happens
 on the input side of edgedetect.

 Note that you can get the same result without inserting the scale filter:
 just move the edgedetect definition before the split filter.

 I do not think that "solving" this kind of problem is a practical
 solution. At some point, users need to realize that complex filter graph
 sometimes need explicit format specification.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2559#comment:4>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker