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-async and -vsync documentation. Based on info from the mailinglist.

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Originally committed as revision 6028 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Benjamin Larsson 2006-08-19 20:00:22 +00:00
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doc/ffmpeg-doc.texi
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@ -504,6 +504,16 @@ streams. This option is used for automatic FFserver testing.
@item -loop_output number_of_times
Repeatedly loop output for formats that support looping such as animated GIF
(0 will loop the output infinitely).
@item -vsync parameter
Video sync method. Video will be stretched/sqeezed to match the timestamps,
it is done by duplicating and droping frames. With -map you can select from
which stream the timestamps should be taken, you can leave either video or
audio unchanged and sync the remaining stream(s) to the unchanged one.
@item -async samples_per_second
Audio sync method. "Stretches/sqeezes" the audio stream to match the timestamps,
the parameter is the maximum samples per second by which the audio is changed.
-async 1 is a special case where only the start of the audio stream is corrected
without any later correction.
@end table
@node FFmpeg formula evaluator