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Clearer explanation of audio channel mapping restrictions

This commit is contained in:
Tim Nicholson 2011-12-21 17:12:05 +00:00 committed by Clément Bœsch
parent 1f797a5826
commit 7028c9f421
1 changed files with 7 additions and 3 deletions
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10
doc/ffmpeg.texi
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@ -825,9 +825,13 @@ The following example split the channels of a stereo input into streams:
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
Note that "-map_channel" is currently limited to the scope of one input for
each output; you can't for example use it to pick multiple input audio files
and mix them into one single output.
Note that currently each output stream can only contain channels from a single
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
is possible.
@item -map_metadata[:@var{metadata_type}][:@var{index}] @var{infile}[:@var{metadata_type}][:@var{index}] (@emph{output,per-metadata})
Set metadata information of the next output file from @var{infile}. Note that