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| author | Gyan Doshi <ffmpeg@gyani.pro> | 2019-03-30 12:07:24 +0530 |
|---|---|---|
| committer | Gyan Doshi <ffmpeg@gyani.pro> | 2019-03-30 12:10:43 +0530 |
| commit | 5282cbae61ccf75dbfbeac5b963812aac90ec8cb (patch) | |
| tree | 3929490c33068586f94a642a367af259ccd1bd45 | |
| parent | 0856c5da0716e9c461d4f73339a2c2390d0a1162 (diff) | |
| download | ffmpeg-5282cbae61ccf75dbfbeac5b963812aac90ec8cb.tar.gz | |
doc/filters: mention input requirements for ebur128
The filter requires input stream to have sample rate 48000 Hz and dbl fmt.
Fixes #7812
| -rw-r--r-- | doc/filters.texi | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index cf13a587ba..867607d870 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -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, |