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vf_pad: add an example employing the sar variable

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This commit is contained in:
Stefano Sabatini 2011-07-30 18:23:24 +02:00
parent 9959a76782
commit 3b5ddf07c0
1 changed files with 6 additions and 0 deletions
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6
doc/filters.texi
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@ -1264,6 +1264,12 @@ pad="max(iw\,ih):ow:(ow-iw)/2:(oh-ih)/2"
# pad the input to get a final w/h ratio of 16:9
pad="ih*16/9:ih:(ow-iw)/2:(oh-ih)/2"
# for anamorphic video, in order to set the output display aspect ratio,
# it is necessary to use sar in the expression, according to the relation:
# (ih * X / ih) * sar = output_dar
# X = output_dar / sar
pad="ih*16/9/sar:ih:(ow-iw)/2:(oh-ih)/2"
# double output size and put the input video in the bottom-right
# corner of the output padded area
pad="2*iw:2*ih:ow-iw:oh-ih"