[FFmpeg-cvslog] doc: document aresample:first_pts

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Mon Jan 21 16:47:34 2013 +0100| [2338af0fb48e600a24ad740b0d996ca7274e8c18] | committer: Michael Niedermayer

doc: document aresample:first_pts

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 at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2338af0fb48e600a24ad740b0d996ca7274e8c18
---

 doc/ffmpeg-resampler.texi |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/doc/ffmpeg-resampler.texi b/doc/ffmpeg-resampler.texi
index 4fb5771..e202795 100644
--- a/doc/ffmpeg-resampler.texi
+++ b/doc/ffmpeg-resampler.texi
@@ -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.
 
+ at 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