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doc: reword and clarify default stream selection.

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Tim Nicholson 2011-11-17 18:08:10 +01:00 committed by Clément Bœsch
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@ -61,10 +61,12 @@ The format option may be needed for raw input files.
@chapter Stream selection
@c man begin STREAM SELECTION
By default ffmpeg tries to pick the "best" stream of each type present in input
files and add them to each output file. For video, this means the highest
resolution, for audio the highest channel count. For subtitle it's simply the
first subtitle stream.
By default ffmpeg includes only one stream of each type (video, audio, subtitle)
present in the input files and adds them to each output file. It picks the
"best" of each based upon the following criteria; for video it is the stream
with the highest resolution, for audio the stream with the most channels, for
subtitle it's the first subtitle stream. In the case where several streams of
the same type rate equally, the lowest numbered stream is chosen.
You can disable some of those defaults by using @code{-vn/-an/-sn} options. For
full manual control, use the @code{-map} option, which disables the defaults just