Merge remote-tracking branch 'qatar/master'

[ffmpeg] / doc / filters.texi

diff --git a/doc/filters.texi b/doc/filters.texi
index d65d45ada82b2aaae4358b64452fb8bc73328c9d..fc33accff7e4a99e96f701f277a368259ad4b4bb 100644 (file)
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -110,7 +110,7 @@ The filter accepts a string of the form:
 the corresponding numeric value defined in @file{libavutil/samplefmt.h}.
 
 @var{channel_layout} specifies the channel layout, and can be a string
-or the corresponding numer value defined in @file{libavutil/chlayout.h}.
+or the corresponding number value defined in @file{libavutil/chlayout.h}.
 
 @var{packing_format} specifies the type of packing in output, can be one
 of "planar" or "packed", or the corresponding numeric values "0" or "1".
@@ -309,8 +309,10 @@ value is "-1".
 
 @section anullsrc
 
-Null audio source, never return audio frames. It is mainly useful as a
-template and to be employed in analysis / debugging tools.
+Null audio source, return unprocessed audio frames. It is mainly useful
+as a template and to be employed in analysis / debugging tools, or as
+the source for filters which ignore the input data (for example the sox
+synth filter).
 
 It accepts an optional sequence of @var{key}=@var{value} pairs,
 separated by ":".
@@ -331,6 +333,10 @@ is "stereo".
 Check the channel_layout_map definition in
 @file{libavcodec/audioconvert.c} for the mapping between strings and
 channel layout values.
+
+@item nb_samples, n
+Set the number of samples per requested frames.
+
 @end table
 
 Follow some examples: