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af_asyncts: add first_pts option 

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.
This commit is contained in:
Justin Ruggles 2012-07-28 12:57:05 -04:00
parent 41f43202cf
commit 70d71b5801
2 changed files with 8 additions and 2 deletions
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7
doc/filters.texi
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@ -205,6 +205,13 @@ adding/dropping samples.
@item max_comp
Maximum compensation in samples per second.
@item first_pts
Assume the first pts should be this value.
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.
@end table
@section channelsplit

3
libavfilter/af_asyncts.c
View File

@ -49,6 +49,7 @@ static const AVOption options[] = {
{ "min_delta", "Minimum difference between timestamps and audio data "
"(in seconds) to trigger padding/trimmin the data.", OFFSET(min_delta_sec), AV_OPT_TYPE_FLOAT, { 0.1 }, 0, INT_MAX, A },
{ "max_comp", "Maximum compensation in samples per second.", OFFSET(max_comp), AV_OPT_TYPE_INT, { 500 }, 0, INT_MAX, A },
{ "first_pts", "Assume the first pts should be this value.", OFFSET(pts), AV_OPT_TYPE_INT64, { AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, A },
{ NULL },
};
@ -73,8 +74,6 @@ static int init(AVFilterContext *ctx, const char *args)
}
av_opt_free(s);
s->pts = AV_NOPTS_VALUE;
return 0;
}