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ffmpeg: pass output stream duration as a hint to the muxer 

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Tobias Rapp 2017-01-18 10:27:01 +01:00 committed by Michael Niedermayer
parent 6c43f33ac2
commit c324e2c5db
2 changed files with 12 additions and 0 deletions
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9
ffmpeg.c
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@ -2908,6 +2908,10 @@ static int init_output_stream_streamcopy(OutputStream *ost)
if (ost->st->time_base.num <= 0 || ost->st->time_base.den <= 0)
ost->st->time_base = av_add_q(av_stream_get_codec_timebase(ost->st), (AVRational){0, 1});
// copy estimated duration as a hint to the muxer
if (ost->st->duration <= 0 && ist->st->duration > 0)
ost->st->duration = av_rescale_q(ist->st->duration, ist->st->time_base, ost->st->time_base);
// copy disposition
ost->st->disposition = ist->st->disposition;
@ -3333,6 +3337,11 @@ static int init_output_stream(OutputStream *ost, char *error, int error_len)
// copy timebase while removing common factors
if (ost->st->time_base.num <= 0 || ost->st->time_base.den <= 0)
ost->st->time_base = av_add_q(ost->enc_ctx->time_base, (AVRational){0, 1});
// copy estimated duration as a hint to the muxer
if (ost->st->duration <= 0 && ist && ist->st->duration > 0)
ost->st->duration = av_rescale_q(ist->st->duration, ist->st->time_base, ost->st->time_base);
ost->st->codec->codec= ost->enc_ctx->codec;
} else if (ost->stream_copy) {
ret = init_output_stream_streamcopy(ost);

3
libavformat/avformat.h
View File

@ -930,6 +930,9 @@ typedef struct AVStream {
* Decoding: duration of the stream, in stream time base.
* If a source file does not specify a duration, but does specify
* a bitrate, this value will be estimated from bitrate and file size.
*
* Encoding: May be set by the caller before avformat_write_header() to
* provide a hint to the muxer about the estimated duration.
*/
int64_t duration;