[FFmpeg-trac] #4814(undetermined:new): swscale default alpha blending drops alpha

FFmpeg trac at avcodec.org
Mon Aug 31 15:18:37 CEST 2015

#4814: swscale default alpha blending drops alpha
             Reporter:  michael      |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  swscale,     |               Resolution:
  alpha                              |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by projectsymphony):

 is there a benchmark related to the performance impact that @cehoyos and
 @michael suggest? At least we would understand what speed degradation we
 can expect.

 Also, imho enabling this flag globally seems more like a workaround that
 many decoders would not need. It would probably be more appropriate to set
 it for decoders that actually needed it, with right CLI options to
 override it or change default background colour.

Ticket URL: <https://trac.ffmpeg.org/ticket/4814#comment:7>
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