@item -thread_queue_size @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.
+discarded if they are not read in a timely manner; setting this value can
+force ffmpeg to use a separate input thread and read packets as soon as they
+arrive. By default ffmpeg only do this if multiple inputs are specified.
@item -sdp_file @var{file} (@emph{global})
Print sdp information for an output stream to @var{file}.
int ret;
InputFile *f = input_files[i];
- if (nb_input_files == 1)
+ if (f->thread_queue_size < 0)
+ f->thread_queue_size = (nb_input_files > 1 ? 8 : 0);
+ if (!f->thread_queue_size)
return 0;
if (f->ctx->pb ? !f->ctx->pb->seekable :
}
#if HAVE_THREADS
- if (nb_input_files > 1)
+ if (f->thread_queue_size)
return get_input_packet_mt(f, pkt);
#endif
return av_read_frame(f->ctx, pkt);
o->limit_filesize = UINT64_MAX;
o->chapters_input_file = INT_MAX;
o->accurate_seek = 1;
+ o->thread_queue_size = -1;
}
static int show_hwaccels(void *optctx, const char *opt, const char *arg)
f->duration = 0;
f->time_base = (AVRational){ 1, 1 };
#if HAVE_THREADS
- f->thread_queue_size = o->thread_queue_size > 0 ? o->thread_queue_size : 8;
+ f->thread_queue_size = o->thread_queue_size;
#endif
/* check if all codec options have been used */