[FFmpeg-trac] #6120(avfilter:new): Transparency ignored in drawbox filter when using the overlay filter

[FFmpeg]

#6120: Transparency ignored in drawbox filter when using the overlay filter
-------------------------------------+-------------------------------------
             Reporter:  est77        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
             Keywords:  drawbox,     |  master
  transparency, overlay              |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 When using drawbox,transparency is ignored if the overlay filter is used
 later in the filter chain. This used to work in version 2.8 but it does
 not work anymore in 3.2 or master.

 How to reproduce:
 {{{
 # Transparency ignored:
 ffmpeg -thread_queue_size 512 -hwaccel auto -threads 0 -y -probesize
 5000000 -r 25 -start_number 1 -i "bg.001.png" -i "logo.png"
 -filter_complex
 "[0:v]null,scale=960x540,drawbox=x=-52.8181818182:y=-1:w=1063.63636364:h=540:t=50:c=#000000 at 0.75[clip];[1:v]scale=iw*0.21:ih*0.21[logo];[clip][logo]overlay=851.05:1.05[clip];[clip]scale=960x540,
 fps=25, setdar=1.77777777778,setpts=PTS-STARTPTS[v]" -map [v]
 result_with_logo.png

 # Correct transparency (but no overlay)
 ffmpeg -thread_queue_size 512 -hwaccel auto -threads 0 -y -probesize
 5000000 -r 25 -start_number 1 -i "bg.001.png" -filter_complex
 "[0:v]null,scale=960x540,drawbox=x=-52.8181818182:y=-1:w=1063.63636364:h=540:t=50:c=#000000 at 0.75,scale=960x540,
 fps=25, setdar=1.77777777778,setpts=PTS-STARTPTS[v]" -map [v]
 result_without_logo.png
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/6120>
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