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doc/filters: add metadata information for blackframe

Reviewed-by: Moritz Barsnick <barsnick@gmx.net>
Signed-off-by: Lou Logan <lou@lrcd.com>
tags/n3.3
Martin Vignali Lou Logan 8 years ago
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@@ -4539,6 +4539,10 @@ 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.

This filter exports frame metadata @code{lavfi.blackframe.pblack}.
The value represents the percentage of pixels in the picture that
are below the threshold value.

It accepts the following parameters:

@table @option


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