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doc/ffmpeg: note that -t is also an input option
Signed-off-by: Lou Logan <lou@lrcd.com>
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@ -272,8 +272,13 @@ ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
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will copy all the streams except the second video, which will be encoded with
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libx264, and the 138th audio, which will be encoded with libvorbis.
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@item -t @var{duration} (@emph{output})
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Stop writing the output after its duration reaches @var{duration}.
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@item -t @var{duration} (@emph{input/output})
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When used as an input option (before @code{-i}), limit the @var{duration} of
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data read from the input file.
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When used as an output option (before an output filename), stop writing the
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output after its duration reaches @var{duration}.
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@var{duration} may be a number in seconds, or in @code{hh:mm:ss[.xxx]} form.
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-to and -t are mutually exclusive and -t has priority.
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