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doc/filters: add a signalstats example 

Signed-off-by: Dave Rice <dave@dericed.com>
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Dave Rice 2014-07-08 23:41:47 -04:00 committed by Paul B Mahol
parent a1e3ea475a
commit a15c5c44e2
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@ -7745,6 +7745,22 @@ ffprobe -f lavfi movie=example.mov,signalstats -show_entries frame_tags=lavfi.si
Playback video while highlighting pixels that are outside of broadcast range in red.
@example
ffplay example.mov -vf signalstats="out=brng:color=red"
@end example
@item
Playback video with signalstats metadata drawn over the frame.
@example
ffplay example.mov -vf signalstats=stat=brng+vrep+tout,drawtext=fontfile=FreeSerif.ttf:textfile=signalstat_drawtext.txt
@end example
The contents of signalstat_drawtext.txt used in the command are:
@example
time %@{pts:hms@}
Y (%@{metadata:lavfi.signalstats.YMIN@}-%@{metadata:lavfi.signalstats.YMAX@})
U (%@{metadata:lavfi.signalstats.UMIN@}-%@{metadata:lavfi.signalstats.UMAX@})
V (%@{metadata:lavfi.signalstats.VMIN@}-%@{metadata:lavfi.signalstats.VMAX@})
saturation maximum: %@{metadata:lavfi.signalstats.SATMAX@}
@end example
@end itemize