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lavf/mux: add the flush_packets option.

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Note: a lot of muxers already do the flushing explicitly.
This commit is contained in:
Nicolas George 2013-03-12 16:54:42 +01:00
parent 125acd2152
commit 4f112a8e34
4 changed files with 15 additions and 0 deletions
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5
doc/ffmpeg-formats.texi
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@ -151,6 +151,11 @@ been without shifting.
Also note that this affects only leading negative timestamps, and not
non-monotonic negative timestamps.
@item flush_packets @var{integer} (@emph{output})
Flush the underlying I/O stream after each packet. Default 1 enables it, and
has the effect of reducing the latency; 0 disables it and may slightly
increase performance in some cases.
@end table
@c man end FORMAT OPTIONS

7
libavformat/avformat.h
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@ -1213,6 +1213,13 @@ typedef struct AVFormatContext {
*/
int seek2any;
/**
* Flush the I/O context after each packet.
* - encoding: Set by user via AVOptions (NO direct access)
* - decoding: unused
*/
int flush_packets;
/*****************************************************************
* All fields below this line are not part of the public API. They
* may not be used outside of libavformat and can be changed and

2
libavformat/mux.c
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@ -494,6 +494,8 @@ static inline int split_write_packet(AVFormatContext *s, AVPacket *pkt)
did_split = av_packet_split_side_data(pkt);
ret = s->oformat->write_packet(s, pkt);
if (s->flush_packets && s->pb && s->pb->error >= 0)
avio_flush(s->pb);
if (did_split)
av_packet_merge_side_data(pkt);
return ret;

1
libavformat/options_table.h
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@ -75,6 +75,7 @@ static const AVOption options[]={
{"avoid_negative_ts", "shift timestamps to make them positive. 1 enables, 0 disables, default of -1 enables when required by target format.", OFFSET(avoid_negative_ts), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, E},
{"skip_initial_bytes", "skip initial bytes", OFFSET(skip_initial_bytes), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX-1, D},
{"correct_ts_overflow", "correct single timestamp overflows", OFFSET(correct_ts_overflow), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, D},
{"flush_packets", "enable flushing of the I/O context after each packet", OFFSET(flush_packets), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E},
{NULL},
};