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doc/filters: update documentation.

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This commit is contained in:
Anton Khirnov 2012-04-03 08:32:23 +02:00
parent 9e8aae443b
commit 7ce118bae5
1 changed files with 8 additions and 10 deletions
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doc/filters.texi
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@ -17,10 +17,11 @@ output pads is called a "sink".
@anchor{Filtergraph syntax}
@section Filtergraph syntax
A filtergraph can be represented using a textual representation, which
is recognized by the @code{-vf} and @code{-af} options in @command{avconv}
and @command{avplay}, and by the @code{av_parse_graph()} function defined in
@file{libavfilter/avfiltergraph}.
A filtergraph can be represented using a textual representation, which is
recognized by the @option{-filter}/@option{-vf} and @option{-filter_complex}
options in @command{avconv} and @option{-vf} in @command{avplay}, and by the
@code{avfilter_graph_parse()}/@code{avfilter_graph_parse2()} function defined in
@file{libavfilter/avfiltergraph.h}.
A filterchain consists of a sequence of connected filters, each one
connected to the previous one in the sequence. A filterchain is
@ -1125,15 +1126,12 @@ Follow some examples:
overlay=main_w-overlay_w-10:main_h-overlay_h-10
# insert a transparent PNG logo in the bottom left corner of the input
movie=logo.png [logo];
[in][logo] overlay=10:main_h-overlay_h-10 [out]
avconv -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):
movie=logo1.png [logo1];
movie=logo2.png [logo2];
[in][logo1] overlay=10:H-h-10 [in+logo1];
[in+logo1][logo2] overlay=W-w-10:H-h-10 [out]
avconv -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