From 4ecfb91b85dfbf0d1d57557a914a535965fe02a3 Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Sat, 3 Mar 2012 19:19:40 +0100 Subject: doc/ffmpeg.texi: apply misc fixes to the -map_channel documentation --- doc/ffmpeg.texi | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) (limited to 'doc') diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi index 3f3cbeb83e..2cb1050b8e 100644 --- a/doc/ffmpeg.texi +++ b/doc/ffmpeg.texi @@ -798,7 +798,7 @@ Note that using this option disables the default mappings for this output file. @item -map_channel [@var{input_file_id}.@var{stream_specifier}.@var{channel_id}|-1][:@var{output_file_id}.@var{stream_specifier}] Map an audio channel from a given input to an output. If -@var{output_file_id}.@var{stream_specifier} are not set, the audio channel will +@var{output_file_id}.@var{stream_specifier} is not set, the audio channel will be mapped on all the audio streams. Using "-1" instead of @@ -820,18 +820,18 @@ The order of the "-map_channel" option specifies the order of the channels in the output stream. The output channel layout is guessed from the number of channels mapped (mono if one "-map_channel", stereo if two, etc.). Using "-ac" in combination of "-map_channel" makes the channel gain levels to be updated if -channel layouts don't match (for instance two "-map_channel" options and "-ac -6"). +input and output channel layouts don't match (for instance two "-map_channel" +options and "-ac 6"). -You can also extract each channel of an @var{INPUT} to specific outputs; the -following command extract each channel of the audio stream (file 0, stream 0) -to the respective @var{OUTPUT_CH0} and @var{OUTPUT_CH1}: +You can also extract each channel of an input to specific outputs; the following +command extracts two channels of the @var{INPUT} audio stream (file 0, stream 0) +to the respective @var{OUTPUT_CH0} and @var{OUTPUT_CH1} outputs: @example ffmpeg -i INPUT -map_channel 0.0.0 OUTPUT_CH0 -map_channel 0.0.1 OUTPUT_CH1 @end example -The following example split the channels of a stereo input into streams: - +The following example splits the channels of a stereo input into two separate +streams, which are put into the same output file: @example ffmpeg -i stereo.wav -map 0:0 -map 0:0 -map_channel 0.0.0:0.0 -map_channel 0.0.1:0.1 -y out.ogg @end example @@ -841,14 +841,13 @@ input stream; you can't for example use "-map_channel" to pick multiple input audio channels contained in different streams (from the same or different files) and merge them into a single output stream. It is therefore not currently possible, for example, to turn two separate mono streams into a single stereo -stream. However spliting a stereo stream into two single channel mono streams +stream. However splitting a stereo stream into two single channel mono streams is possible. If you need this feature, a possible workaround is to use the @emph{amerge} filter. For example, if you need to merge a media (here @file{input.mkv}) with 2 mono audio streams into one single stereo channel audio stream (and keep the -video stream): - +video stream), you can use the following command: @example ffmpeg -i input.mkv -f lavfi -i " amovie=input.mkv:si=1 [a1]; -- cgit v1.2.3