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