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ffmpeg: allow to set the thread message queue size.

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This commit is contained in:
Nicolas George 2015-02-25 11:50:44 +01:00
parent a92193f247
commit 508d6a23b4
4 changed files with 15 additions and 1 deletions
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6
doc/ffmpeg.texi
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@ -1158,6 +1158,12 @@ This option enables or disables accurate seeking in input files with the
transcoding. Use @option{-noaccurate_seek} to disable it, which may be useful
e.g. when copying some streams and transcoding the others.
@item -thread_message_queue @var{size} (@emph{input})
This option sets the maximum number of queued packets when reading from the
file or device. With low latency / high rate live streams, packets may be
discarded if they are not read in a timely manner; raising this value can
avoid it.
@item -override_ffserver (@emph{global})
Overrides the input specifications from @command{ffserver}. Using this
option you can map any input stream to @command{ffserver} and control

2
ffmpeg.c
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@ -3420,7 +3420,7 @@ static int init_input_threads(void)
strcmp(f->ctx->iformat->name, "lavfi"))
f->non_blocking = 1;
ret = av_thread_message_queue_alloc(&f->in_thread_queue,
8, sizeof(AVPacket));
f->thread_queue_size, sizeof(AVPacket));
if (ret < 0)
return ret;

2
ffmpeg.h
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@ -111,6 +111,7 @@ typedef struct OptionsContext {
int64_t input_ts_offset;
int rate_emu;
int accurate_seek;
int thread_queue_size;
SpecifierOpt *ts_scale;
int nb_ts_scale;
@ -350,6 +351,7 @@ typedef struct InputFile {
pthread_t thread; /* thread reading from this file */
int non_blocking; /* reading packets from the thread should not block */
int joined; /* the thread has been joined */
int thread_queue_size; /* maximum number of queued packets */
#endif
} InputFile;

6
ffmpeg_opt.c
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@ -951,6 +951,9 @@ static int open_input_file(OptionsContext *o, const char *filename)
f->nb_streams = ic->nb_streams;
f->rate_emu = o->rate_emu;
f->accurate_seek = o->accurate_seek;
#if HAVE_PTHREADS
f->thread_queue_size = o->thread_queue_size > 0 ? o->thread_queue_size : 8;
#endif
/* check if all codec options have been used */
unused_opts = strip_specifiers(o->g->codec_opts);
@ -2957,6 +2960,9 @@ const OptionDef options[] = {
{ "disposition", OPT_STRING | HAS_ARG | OPT_SPEC |
OPT_OUTPUT, { .off = OFFSET(disposition) },
"disposition", "" },
{ "thread_queue_size", HAS_ARG | OPT_INT | OPT_OFFSET | OPT_EXPERT | OPT_INPUT,
{ .off = OFFSET(thread_queue_size) },
"set the maximum number of queued packets from the demuxer" },
/* video options */
{ "vframes", OPT_VIDEO | HAS_ARG | OPT_PERFILE | OPT_OUTPUT, { .func_arg = opt_video_frames },