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doc: document aresample:first_pts

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Documentation copied from asyncts, the options are supposed to do
the same thing. If not please submit a testcase where they differ
so we can fix it.

Disscussed-with: saste on IRC
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Michael Niedermayer 2013-01-21 16:47:34 +01:00
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commit 2338af0fb4
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doc/ffmpeg-resampler.texi
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@ -172,6 +172,14 @@ may be stretched or squeezed for each second.
Default value is 0, thus no compensation is applied to make the samples match
the audio timestamps.
@item first_pts
For swr only, assume the first pts should be this value. The time unit 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 or to trim any samples
with a negative pts due to encoder delay.
@item min_comp
For swr only, set the minimum difference between timestamps and audio data (in
seconds) to trigger stretching/squeezing/filling or trimming of the