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| author | Stefano Sabatini <stefasab@gmail.com> | 2013-04-08 12:22:48 +0200 |
|---|---|---|
| committer | Stefano Sabatini <stefasab@gmail.com> | 2013-04-10 13:11:27 +0200 |
| commit | 006e20bd3655443e2d709dfbee468af2805a994a (patch) | |
| tree | b5528eebdf3d61a5fc236b56ec22716c7be401d5 /doc | |
| parent | cc3edd99a678b9ecfe70cb3632029cb8db40e7f9 (diff) | |
| download | ffmpeg-006e20bd3655443e2d709dfbee468af2805a994a.tar.gz | |
lavfi/overlay: add enable expression
This expression is useful to enable/disable overlaying on the fly.
Note that this can't be easily done relying on the filtergraph structure,
since this implies caching issues or a null frame overlaying in the best
case, which is better avoided for performance and convenience reasons.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/filters.texi | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 4668b7fc53..215e4387a2 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -4267,8 +4267,14 @@ on the main video. Default value is "0" for both expressions. In case the expression is invalid, it is set to a huge value (meaning that the overlay will not be displayed within the output visible area). +@item enable +Set the expression which enables the overlay. If the evaluation is +different from 0, the overlay is displayed on top of the input +frame. By default it is "1". + @item eval -Set when the expressions for @option{x} and @option{y} are evaluated. +Set when the expressions for @option{x}, @option{y}, and +@option{enable} are evaluated. It accepts the following values: @table @samp @@ -4308,8 +4314,8 @@ color space. Default value is 0. This option is deprecated, use @option{format} instead. @end table -The @option{x}, and @option{y} expressions can contain the following -parameters. +The @option{x}, @option{y}, and @option{enable} expressions can +contain the following parameters. @table @option @item main_w, W |