doc/filters: add scale2ref example for proportional scaling

6 years ago · 21832b93d5
parent 9d269301f0
commit 21832b93d5
1 changed files with 6 additions and 0 deletions
--- a/doc/filters.texi
+++ b/doc/filters.texi
@ -15316,6 +15316,12 @@ Scale a subtitle stream (b) to match the main video (a) in size before overlayin
@example
 'scale2ref[b][a];[a][b]overlay'
@end example
+
+@item
+Scale a logo to 1/10th the height of a video, while preserving its display aspect ratio.
+@example
+[logo-in][video-in]scale2ref=w=oh*mdar:h=ih/10[logo-out][video-out]
+@end example
@end itemize

@anchor{selectivecolor}