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doc/filters: rework and itemize examples for the overlay filter

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Stefano Sabatini
2012-12-15 15:06:01 +01:00
parent bde1e8bf06
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doc/filters.texi
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@@ -3214,35 +3214,58 @@ to pass the two inputs through a @var{setpts=PTS-STARTPTS} filter to
have them begin in the same zero timestamp, as it does the example for have them begin in the same zero timestamp, as it does the example for
the @var{movie} filter. the @var{movie} filter.
Follow some examples:
@example
# draw the overlay at 10 pixels from the bottom right
# corner of the main video.
overlay=main_w-overlay_w-10:main_h-overlay_h-10
# insert a transparent PNG logo in the bottom left corner of the input
ffmpeg -i input -i logo -filter_complex 'overlay=10:main_h-overlay_h-10' output
# insert 2 different transparent PNG logos (second logo on bottom
# right corner):
ffmpeg -i input -i logo1 -i logo2 -filter_complex
'overlay=10:H-h-10,overlay=W-w-10:H-h-10' output
# add a transparent color layer on top of the main video,
# WxH specifies the size of the main input to the overlay filter
color=red@@.3:WxH [over]; [in][over] overlay [out]
# play an original video and a filtered version (here with the deshake filter)
# side by side
ffplay input.avi -vf 'split[a][b]; [a]pad=iw*2:ih[src]; [b]deshake[filt]; [src][filt]overlay=w'
# the previous example is the same as:
ffplay input.avi -vf 'split[b], pad=iw*2[src], [b]deshake, [src]overlay=w'
@end example
You can chain together more overlays but the efficiency of such You can chain together more overlays but the efficiency of such
approach is yet to be tested. approach is yet to be tested.
@subsection Examples
@itemize
@item
Draw the overlay at 10 pixels from the bottom right corner of the main
video:
@example
overlay=main_w-overlay_w-10:main_h-overlay_h-10
@end example
Using named options the example above becomes:
@example
overlay=x=main_w-overlay_w-10:y=main_h-overlay_h-10
@end example
@item
Insert a transparent PNG logo in the bottom left corner of the input,
using the @command{ffmpeg} tool with the @code{-filter_complex} option:
@example
ffmpeg -i input -i logo -filter_complex 'overlay=10:main_h-overlay_h-10' output
@end example
@item
Insert 2 different transparent PNG logos (second logo on bottom
right corner) using the @command{ffmpeg} tool:
@example
ffmpeg -i input -i logo1 -i logo2 -filter_complex 'overlay=10:H-h-10,overlay=W-w-10:H-h-10' output
@end example
@item
Add a transparent color layer on top of the main video, WxH specifies
the size of the main input to the overlay filter:
@example
color=red@@.3:WxH [over]; [in][over] overlay [out]
@end example
@item
Play an original video and a filtered version (here with the deshake
filter) side by side using the @command{ffplay} tool:
@example
ffplay input.avi -vf 'split[a][b]; [a]pad=iw*2:ih[src]; [b]deshake[filt]; [src][filt]overlay=w'
@end example
The above command is the same as:
@example
ffplay input.avi -vf 'split[b], pad=iw*2[src], [b]deshake, [src]overlay=w'
@end example
@end itemize
@section pad @section pad
Add paddings to the input image, and places the original input at the Add paddings to the input image, and places the original input at the