#4065: support aspect-ratio changes in scale and pad filters
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Reporter: mikaraento | Type:
Status: new | enhancement
Component: avfilter | Priority: normal
Keywords: | Version:
Blocking: | unspecified
Analyzed by developer: 0 | Blocked By:
| Reproduced by developer: 0
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Currently it's reasonably easy to column (and letter) -box fixed-aspect-
ratio input in ffmpeg, by using something like:
{{{
ffmpeg -filter_complex '[0:0]scale=iw*sar:ih,scale=-1:432,pad=768:432:(ow-
iw)/2:(oh-ih)/2,setdar=16:9[outv]'
}}}
However, if the input has aspect-ratio changes (dimensions or sar) mid-
stream, the above won't work.
It would be nice to have per-frame -evaluated versions of the variables
for scale and pad. (and the required other changes in these filters that
assume that they don't change)
--
Ticket URL: <https://trac.ffmpeg.org/ticket/4065>
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