#6120: Transparency ignored in drawbox filter when using the overlay filter
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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@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@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>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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