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doc/filters: mention input requirements for ebur128

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The filter requires input stream to have sample rate 48000 Hz and dbl fmt.

Fixes #7812
This commit is contained in:
Gyan Doshi 2019-03-30 12:07:24 +05:30
parent 0856c5da07
commit 5282cbae61
1 changed files with 7 additions and 2 deletions
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doc/filters.texi
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@ -20587,11 +20587,16 @@ ebur128=metadata=1,adrawgraph=lavfi.r128.M:min=-120:max=5
@anchor{ebur128}
@section ebur128
EBU R128 scanner filter. This filter takes an audio stream as input and outputs
it unchanged. By default, it logs a message at a frequency of 10Hz with the
EBU R128 scanner filter. This filter takes an audio stream and analyzes its loudness
level. By default, it logs a message at a frequency of 10Hz with the
Momentary loudness (identified by @code{M}), Short-term loudness (@code{S}),
Integrated loudness (@code{I}) and Loudness Range (@code{LRA}).
The filter can only analyze streams which have a sampling rate of 48000 Hz and whose
sample format is double-precision floating point. The input stream will be converted to
this specification, if needed. Users may need to insert aformat and/or aresample filters
after this filter to obtain the original parameters.
The filter also has a video output (see the @var{video} option) with a real
time graph to observe the loudness evolution. The graphic contains the logged
message mentioned above, so it is not printed anymore when this option is set,