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@@ -348,8 +348,13 @@ Stop writing to the stream after @var{framecount} frames.
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@item -q[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
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@itemx -qscale[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
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-Use fixed quality scale (VBR). The meaning of @var{q} is
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+Use fixed quality scale (VBR). The meaning of @var{q}/@var{qscale} is
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codec-dependent.
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+If @var{qscale} is used without a @var{stream_specifier} then it applies only
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+to the video stream, this is to maintain compatibility with previous behavior
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+and as specifying the same codec specific value to 2 different codecs that is
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+audio and video generally is not what is intended when no stream_specifier is
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+used.
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@anchor{filter_option}
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@item -filter[:@var{stream_specifier}] @var{filtergraph} (@emph{output,per-stream})
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Michael Niedermayer