do you tune rc_lookahead to zero? On Wed, Jun 6, 2012 at 2:57 PM, Aleksey Shubin <[email protected]> wrote: > Good day to all. > > I'm using libav in my application to encode live video to h264, mux it > in Live Smooth Streaming format and send to IIS Live Smooth Streaming > publishing point (via http). > > I need to achieve quite low latency (<3 seconds) of live video. When > the video is recorded on regular frame rate (20-30 fps), everything is > good and latency is even lower. But when I try lower fps values, the > latency grows. For 5 fps the latency is 5-6 seconds, for 2 fps it is > 11 seconds and for 1 fps - 21 second. > > I've measured time of the encoding of each frame, it is approximately > 1.5 seconds and didn't changed with fps. Also disabled all buffering > at the video player side to exclude it. So the problem seems to be > somewhere at http transfer process (that is performed by libav too). > > First I thought that some kind of buffer is used in libav for http > transfer, and on the lower frame rate it is filled slower, and that's > the reason of increased latency. But changing video resolution and > bitrate doesn't affect on latency, though obviously should change > encoded frame size and so change the buffer filling rate. > > Now I'm completely out of ideas what is reason of that latency and how > to remove it. Does anyone have any suggestions? >
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