Lag between appsource and appsink

[Tim Müller]

On Mon, 2014-08-11 at 07:50 -0700, mansi.karan wrote:

Hi,

> I am using x264enc to encode a live video stream.
> The problem I am facing is that appsrc need-data callback is called at least
> 40 times before first new-buffer callback is called, which results in a
> delay of around 6-7 seconds, even when I use apprtc.appspot.com loopback. 
> The pipeline is :
> appsrc ! videoparse format=I420 width=$width height=$height framerate=$rate
> ! x264enc byte-stream=true ! appsink.
> I have tried is-live, min/max latency and do-timestamp properties but to no
> avail.
> Is there something I am doing wrong? Please help me out. 

No, nothing you're doing wrong.

By default x264enc is configured to use a very high latency which allows
higher quality (with everything else equal).

You can use   x264enc tune=zerolatency  to make it output things pretty
much instantly, or use the other properties (e.g. key-int-max) to
configure a trade-off that's suitable for your use case.

Cheers
 -Tim

-- 
Tim Müller, Centricular Ltd - http://www.centricular.com