[FFmpeg-trac] #6718(undetermined:new): Option to remove label on alpha channel

[FFmpeg]

#6718: Option to remove label on alpha channel
-------------------------------------+-------------------------------------
             Reporter:  ttdww        |                     Type:  task
               Status:  new          |                 Priority:  important
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  label        |               Blocked By:
  interpret alpha                    |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 When FFMPEG writes to RGBA PNG 32bit .MOV Quicktime, it seems to label
 alpha to be interpreted as 'straight' when we need the files to have 'no
 label' so After effects can remember it's own interpretation setting for
 'Import of an unlabeled alpha'.  Otherwise users will constantly have to
 force the interpretation of every FFMPEG created PNG file they import
 regardless of what After Effects is set to.

 Version of FFMPEG:  ffmpeg-20170921-183fd30-win64-static

 How to reproduce:
 ffmpeg.exe -r 24 -f image2 "explosion.%%04d.exr" -vcodec png -pix_fmt rgba
 -y "explosion.mov"

 If we are doing something wrong, we apologize.  We have searched far and
 wide for an answer.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6718>
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