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Diffstat (limited to 'doc/filters.texi')
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diff --git a/doc/filters.texi b/doc/filters.texi index d000276599..5ebaf99f4c 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -71,6 +71,27 @@ build. Below is a description of the currently available video filters. +@section blackframe + +Detect frames that are (almost) completely black. Can be useful to +detect chapter transitions or commercials. Output lines consist of +the frame number of the detected frame, the percentage of blackness, +the position in the file if known or -1 and the timestamp in seconds. + +In order to display the output lines, you need to set the loglevel at +least to the AV_LOG_INFO value. + +The filter accepts the syntax: +@example +blackframe[=@var{amount}:[@var{threshold}]] +@end example + +@var{amount} is the percentage of the pixels that have to be below the +threshold, and defaults to 98. + +@var{threshold} is the threshold below which a pixel value is +considered black, and defaults to 32. + @section crop Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}. |