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doc: improve documentation for the asyncts filter first_pts option

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Note the time base for the option. Add an additional example description.
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Justin Ruggles 2012-12-12 13:19:16 -05:00
parent c143de40c3
commit b35e5d985d
1 changed files with 3 additions and 2 deletions
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doc/filters.texi
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@ -250,11 +250,12 @@ Maximum compensation in samples per second. Relevant only with compensate=1.
Default value 500.
@item first_pts
Assume the first pts should be this value.
Assume the first pts should be this value. The time base is 1 / sample rate.
This allows for padding/trimming at the start of stream. By default, no
assumption is made about the first frame's expected pts, so no padding or
trimming is done. For example, this could be set to 0 to pad the beginning with
silence if an audio stream starts after the video stream.
silence if an audio stream starts after the video stream or to trim any samples
with a negative pts due to encoder delay.
@end table