[FFmpeg-trac] #9686(undetermined:new): drawbox breaks dynamic size

[FFmpeg]

#9686: drawbox breaks dynamic size
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             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Description changed by Jozef Chutka:

Old description:

> When a particular combination of format+drawbox is used, it can break
> dynamic size.
>
> In the following sample green box gets smaller over time, while there is
> red box draw on it. Following combination of format+scale+drawbox however
> does not work and green box remain the original size.
>
> {{{
> ffmpeg -filter_complex
> "color=c=black:r=20:s=400x400,format=argb[b];color=c=green:r=20:s=200x200,format=argb,scale=w=400-n:h=400-n:eval=frame,drawbox=w=10:h=10:t=fill:c=red[g];[b][g]overlay=format=auto"
> -t 4 -y out.mp4
> }}}
> Patches should be submitted to the ffmpeg-devel mailing list and not this
> bug tracker.
>
> One can fix it by either:
> 1. remove `format=argb` from `[b]`
> 2. remove `drawbox`
> 3. remove `format=auto` in `overlay`

New description:

 When a particular combination of format+drawbox is used, it can break
 dynamic size.

 In the following sample green box gets smaller over time, while there is
 red box drawn on it. Following combination of format+scale+drawbox however
 does not work and green box remains with the original size.

 {{{
 ffmpeg -filter_complex
 "color=c=black:r=20:s=400x400,format=argb[b];color=c=green:r=20:s=200x200,format=argb,scale=w=400-n:h=400-n:eval=frame,drawbox=w=10:h=10:t=fill:c=red[g];[b][g]overlay=format=auto"
 -t 4 -y out.mp4
 }}}

 One can fix it by either:
 1. remove `format=argb` from `[b]`
 2. remove `drawbox`
 3. remove `format=auto` in `overlay`

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Ticket URL: <https://trac.ffmpeg.org/ticket/9686#comment:2>
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