[gst-devel] Ubuntu and Gstreamer

[Thomaz Barros]

Hi Rob, thanks for your response. I just tried your suspect today because i
had other problems during the week. I built the lastest gstreamer core and
plugins version and the latest libx264 release but it didn't work as well
but your options aren't displayed to me.

2010/8/28 Rob <robert.swain at gmail.com>

> On 27 August 2010 21:23, Thomaz Barros <thomazavila at gmail.com> wrote:
> > Hi all, I'm having some problems with Gstreamer in a Ubuntu 10.04
> desktop.
> > I'm trying to make an H.264 streaming application but there is a delay
> about
> > 2-3 seconds.
>
> > VENC=" timeoverlay ! x264enc  byte-stream=true bitrate=2000 cabac=false !
>
> I'm not certain but I suspect it could be x264enc introducing the
> delay. Ideally you need an x264 newer than the one in 10.04 (newer
> than API version 85) and then the next GStreamer release compiled
> against it. Then you could use the tune=0x4 option which enables a
> zero latency tuning. However, the zero latency tuning corresponds to:
>
>        else if( !strncasecmp( s, "zerolatency", 11 ) )
>        {
>            param->rc.i_lookahead = 0;
>            param->i_sync_lookahead = 0;
>            param->i_bframe = 0;
>            param->b_sliced_threads = 1;
>            param->b_vfr_input = 0;
>            param->rc.b_mb_tree = 0;
>        }
>
> (from x264/common/common.c)
>
> Which, in GStreamer properties with newer -ugly from the GStreamer
> developers' PPA could also be given as:
>
> rc-lookahead=0 sync-lookahead=0 bframes=0 sliced-threads=1 mb-tree=0
> (variable frame rate input is not exposed through the properties).
> Perhaps some of those options are only available in newer x264 APIs
> and so are not relevant to older x264 as they were not yet
> implemented.
>
> Give it a go. Hopefully it will help. :) I think lookahead introduces
> the largest delay when encoding.
>
> Regards,
> Rob
>
>
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