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avfilter/af_silencedetect: document metadata

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Reviewed-by: Moritz Barsnick <barsnick@gmx.net>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
This commit is contained in:
Limin Wang 2019-10-08 23:04:51 +08:00 committed by Gyan Doshi
parent 09581f7923
commit 0afc1fe147
2 changed files with 10 additions and 2 deletions
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11
doc/filters.texi
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@ -4683,7 +4683,16 @@ This filter logs a message when it detects that the input audio volume is less
or equal to a noise tolerance value for a duration greater or equal to the or equal to a noise tolerance value for a duration greater or equal to the
minimum detected noise duration. minimum detected noise duration.
The printed times and duration are expressed in seconds. The printed times and duration are expressed in seconds. The
@code{lavfi.silence_start} or @code{lavfi.silence_start.X} metadata key
is set on the first frame whose timestamp equals or exceeds the detection
duration and it contains the timestamp of the first frame of the silence.
The @code{lavfi.silence_duration} or @code{lavfi.silence_duration.X}
and @code{lavfi.silence_end} or @code{lavfi.silence_end.X} metadata
keys are set on the first frame after the silence. If @option{mono} is
enabled, and each channel is evaluated separately, the @code{.X}
suffixed keys are used, and @code{X} corresponds to the channel number.
The filter accepts the following options: The filter accepts the following options:

1
libavfilter/af_silencedetect.c
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@ -187,7 +187,6 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
s->frame_end = insamples->pts + av_rescale_q(insamples->nb_samples, s->frame_end = insamples->pts + av_rescale_q(insamples->nb_samples,
(AVRational){ 1, s->last_sample_rate }, inlink->time_base); (AVRational){ 1, s->last_sample_rate }, inlink->time_base);
// TODO: document metadata
s->silencedetect(s, insamples, nb_samples, nb_samples_notify, s->silencedetect(s, insamples, nb_samples, nb_samples_notify,
inlink->time_base); inlink->time_base);