diff options
| author | Stefano Sabatini <stefasab@gmail.com> | 2012-08-08 13:44:11 +0200 |
|---|---|---|
| committer | Stefano Sabatini <stefasab@gmail.com> | 2012-08-09 01:03:05 +0200 |
| commit | f6580b50edd1f1e0eb92309a16fe90cc911ccf5e (patch) | |
| tree | fa68df9b437d107903ab061d998159e015f98323 /doc | |
| parent | 11a1033c9fcae380f4da06b2b0253ab0eb82b026 (diff) | |
lavfi: add asetpts audio filter
Based on an idea by Andrey Utkin <andrey.krieger.utkin@gmail.com>.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/filters.texi | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index e73fc09431..a5627525a9 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -3032,9 +3032,11 @@ Mark the frame as top-field-first. Mark the frame as progressive. @end table -@section setpts +@section asetpts, setpts -Change the PTS (presentation timestamp) of the input video frames. +Change the PTS (presentation timestamp) of the input frames. + +@code{asetpts} works on audio frames, @code{setpts} on video frames. Accept in input an expression evaluated through the eval API, which can contain the following constants: @@ -3046,6 +3048,16 @@ the presentation timestamp in input @item N the count of the input frame, starting from 0. +@item NB_CONSUMED_SAMPLES +the number of consumed samples, not including the current frame (only +audio) + +@item NB_SAMPLES +the number of samples in the current frame (only audio) + +@item SAMPLE_RATE +audio sample rate + @item STARTPTS the PTS of the first video frame @@ -3084,6 +3096,9 @@ setpts=N/(25*TB) # fixed rate 25 fps with some jitter setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))' + +# apply an offset of 10 seconds to the input PTS +setpts=PTS+10/TB @end example @section settb, asettb |