[FFmpeg-trac] #9538(undetermined:new): eq filter does not maintain transparency

FFmpeg trac at avcodec.org
Mon Nov 29 12:53:17 EET 2021

#9538: eq filter does not maintain transparency
             Reporter:  Jozef Chutka  |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  undetermined  |                  Version:  4.4.1
             Keywords:  eq            |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
 Using `eq` filter, the transparency information is lost and black pixles
 are rendered instead.

 How to reproduce:
 ffmpeg -filter_complex
 -frames:v 1 output/out-eq.png -y

 Notice, there is a small cut in the middle of rainbow.png. When using `eq`
 filter this part gets rendered as black instead of the proper background

 Removing the `eq` from the chain, it does the job properly
 ffmpeg -filter_complex
 -frames:v 1 output/out.png -y

 The issue exists with 4.4.1 and also latest builds.
Ticket URL: <https://trac.ffmpeg.org/ticket/9538>
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