What are the correct x264 settings to achieve the lowest latency possible?

Question

I'm making a streaming system than consists of

backend - generates and encodes 1280x720@30fps with libx264 and sends NALUs to frontend over UDP
frontend - receives frames from backend, decodes with ffmpeg and draws on the screen

I'm trying to achieve the lowest latency possible.

What is the lowest achievable latency?
What are the correct settings for the encoder?
What should I take into account?

See this link for inspiration http://forum.doom9.org/archive/index.php/t-164688.html — Fredrik Pihl, May 23 '13 at 12:59

score 0 · Answer 1 · answered May 27 '13 at 21:37

0

The easiest thing would be to set –intra-refresh –-tune zerolatency and set --vbv-bufsize to equal to you bitrate divided by framerate. Note that these settings will likely produce lower quality video due to lack for B frames, and other optimizations.

answered May 27 '13 at 21:37

szatmary

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I still get latency ~200ms and can't find the reason. – Vitali Kotik Aug 09 '13 at 22:51

What are the correct x264 settings to achieve the lowest latency possible?

1 Answers1