[FFmpeg-devel] [PATCH] doc: document aresample:first_pts

Michael Niedermayer michaelni at gmx.at
Mon Jan 21 16:47:34 CET 2013

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.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
 doc/ffmpeg-resampler.texi |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/doc/ffmpeg-resampler.texi b/doc/ffmpeg-resampler.texi
index d45126f..cd3c02e 100644
--- a/doc/ffmpeg-resampler.texi
+++ b/doc/ffmpeg-resampler.texi
@@ -168,6 +168,14 @@ 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.
+ at item first_pts
+For swr only, 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 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

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