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doc/ffmpeg: document qscale and video stream special case 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Michael Niedermayer 2013-11-17 16:00:47 +01:00
parent 459c7cb256
commit 74a8fe9483
1 changed files with 6 additions and 1 deletions
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doc/ffmpeg.texi
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@ -348,8 +348,13 @@ Stop writing to the stream after @var{framecount} frames.
@item -q[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
@itemx -qscale[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
Use fixed quality scale (VBR). The meaning of @var{q} is
Use fixed quality scale (VBR). The meaning of @var{q}/@var{qscale} is
codec-dependent.
If @var{qscale} is used without a @var{stream_specifier} then it applies only
to the video stream, this is to maintain compatibility with previous behavior
and as specifying the same codec specific value to 2 different codecs that is
audio and video generally is not what is intended when no stream_specifier is
used.
@anchor{filter_option}
@item -filter[:@var{stream_specifier}] @var{filtergraph} (@emph{output,per-stream})