[FFmpeg-devel] [PATCH] Add detail to the documentation for ffmpeg -map.

Mike Scheutzow mike.scheutzow
Mon Feb 28 22:23:32 CET 2011

Stefano Sabatini wrote:
> On date Monday 2011-02-28 09:36:55 -0500, Mike Scheutzow encoded:
>> Mike Scheutzow wrote:
>>> + at example
>>> +ffmpeg -i INPUT OUTPUT -map 0.1
>>> + at end example
>> I take back my "ok". The first example only works for some input files.
>> With an input file of video 0.0 and audio 0.1, the first example
>> fails with this message:
>> "Number of stream maps must match number of output streams"
>> ffmpeg thinks the number of output streams is 2.
> Yes the command only can work with an output file with only one
> stream (for example: two audio streams in input, and you want to
> select which one to put in the output, by default ffmpeg will take the
> first one, map is needed for selecting the other one).
> Patch updated, should clarify the example.

Patch ok.

Mike Scheutzow

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