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

FFmpeg trac at avcodec.org
Fri Oct 6 03:51:55 EEST 2017

#6718: Option to remove label on alpha channel
             Reporter:  ttdww        |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  alpha        |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by ttdww):

 From what I'm understanding, some filetypes (not sure which ones, but
 definitely Quicktime PNG 32bit can get a property or metadata string added
 to the file which defines how the alpha should be interpreted.  Most
 programs I've seen that output PNG don't add one so that the image editing
 app importing it can force it to setting per that app.  Somehow when
 FFMPEG is writing it, it seems it's getting that property added and set to
 'straight'.  This is my best guess, however I'm not a coder.

Ticket URL: <https://trac.ffmpeg.org/ticket/6718#comment:7>
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