doc: fix various typos and grammar errors

[ffmpeg] / doc / demuxers.texi

diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index e34f8b3fe667301ece6c2b559207d09291161123..87f78f3dae7aba4a21f905d555835cb23b712a1e 100644 (file)
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -72,7 +72,7 @@ Do not try to resynchronize by looking for a certain optional start code.
 Virtual concatenation script demuxer.
 
 This demuxer reads a list of files and other directives from a text file and
-demuxes them one after the other, as if all their packet had been muxed
+demuxes them one after the other, as if all their packets had been muxed
 together.
 
 The timestamps in the files are adjusted so that the first file starts at 0
@@ -107,7 +107,7 @@ Identify the script type and version. It also sets the @option{safe} option
 to 1 if it was -1.
 
 To make FFmpeg recognize the format automatically, this directive must
-appears exactly as is (no extra space or byte-order-mark) on the very first
+appear exactly as is (no extra space or byte-order-mark) on the very first
 line of the script.
 
 @item @code{duration @var{dur}}
@@ -267,6 +267,33 @@ track. Track indexes start at 0. The demuxer exports the number of tracks as
 
 For very large files, the @option{max_size} option may have to be adjusted.
 
+@section libopenmpt
+
+libopenmpt based module demuxer
+
+See @url{https://lib.openmpt.org/libopenmpt/} for more information.
+
+Some files have multiple subsongs (tracks) this can be set with the @option{subsong}
+option.
+
+It accepts the following options:
+
+@table @option
+@item subsong
+Set the subsong index. This can be either  'all', 'auto', or the index of the
+subsong. Subsong indexes start at 0. The default is 'auto'.
+
+The default value is to let libopenmpt choose.
+
+@item layout
+Set the channel layout. Valid values are 1, 2, and 4 channel layouts.
+The default value is STEREO.
+
+@item sample_rate
+Set the sample rate for libopenmpt to output.
+Range is from 1000 to INT_MAX. The value default is 48000.
+@end table
+
 @section gif
 
 Animated GIF demuxer.