[gst-devel] Reducing the time in GST-registry updating and parsing the command line arguments

[tamil arasu]

Hi All,

            We are using the DM365 target board. I wrote one Audio streaming
application.I have attached that source code.This application takes three
second to execute.Its taking two second to execute gst_init(&argc,&argv)
API ,We used the Libraries mentioned below

gst-plugins-good-0.10.14, gst-plugins-base-0.10.23,
gstreamer-0.10.23,gst-plugins-bad-0.10.13, liboil ,libxml , libiconv

Is it possible to get executed in one second.

Can anyone help on this issue


regards,

Arasu.M







On Sun, Nov 28, 2010 at 6:00 PM, Marco Ballesio <gibrovacco at gmail.com>wrote:

> Hi,
>
> as usual, a late reply. Here anyway my 0.05 €..
>
> On Mon, Nov 22, 2010 at 4:42 PM, tamil arasu <marasu2010 at gmail.com> wrote:
> > HI All,
> >
> >             We are using the gstreamer for  capturing the video .we are
> > using packages mentioned below
> >
> > gst-plugins-good-0.10.14, gst-plugins-base-0.10.23, gstreamer-0.10.23,
> > gst-plugins-bad-0.10.13
> >
> > we are using the pipeline for capturing the video mentioned  below
> >
> > export GST_REGISTRY_UPDATE=no
> > export GST_REGISTRY_FORK=no
> >
>
> I don't think it is necessary to set "GST_REGISTRY_FORK=no" in order
> to get any improvement. Actually, imo setting this would make things
> worse in your case (see below).
>
> > gst-launch rtspsrc location=rtsp://192.168.1.168:8554/mpeg4 latency=100
> > name=demux demux. ! queue ! rtpmp4vdepay ! mpeg4videoparse !
> dmaidec_mpeg4 !
> > TIDmaiVideoSink videoOutput=LCD videoStd=320X240 demux. ! queue !
> > rtppcmudepay ! mulawdec ! alsasink
> >
> > When we launch the above mentiond pileline on the command line,we are
> able
> > to display video on Lcd.The output is
> >
> > Setting pipeline to PAUSED ...
> > Pipeline is live and does not need PREROLL ...
> > Setting pipeline to PLAYING ...
> > DavinciDisplay DavinciDisplay.1: Before finishing with S_FMT:
> > layer.pix_fmt.bytesperline = 320,
> >  layer.pix_fmt.width = 320,
> >  layer.pix_fmt.height = 240,
> >  layer.pix_fmt.sizeimage =115200
> > New clock: GstSyDavinciDisplay DavinciDisplay.1: pixfmt->width = 320,
> >  layer->layer_info.config.line_length= 320
> > stemClock
> >
> > Once I run the above command ,its taking 2 second to get  the  first
> message
> > (Setting pipeline to PAUSED ...).
> > one second for update the registry,
>
> it's strange, as you've set GST_REGISTRY_UPDATE to "no". How did you
> understand this latency is caused when updating the registry?
>
> In gstregistry.c, setting GST_REGISTRY_FORK=no forces the scan helper
> state to "REGISTRY_SCAN_HELPER_NOT_STARTED" in opposition to
> "REGISTRY_SCAN_HELPER_DISABLED".
>
> Just to say that, probably, disabling forks you did preempts any
> settings in GST_REGISTRY_UPDATE and triggers a registry generation
> anyway.
>
> > anothe one second for parsing the command
> > line arguments.(gst_parse_launchv)
> >
>
> you'll get rid of this by building the pipeline "manually" in a custom
> application. See here for more help:
>
> http://www.gstreamer.net/data/doc/gstreamer/head/manual/html/index.html
>
> > how to reduce the this 2 second.Can anyone help me on this issue?
>
> See above. Probably some extra-latency is caused by the video decoder
> buffering a fixed amount of memory but, as long as your source is in
> the local filesystem, its effect would be negligible.
>
> Regards
>
> >
> >
> > thanks and regards,
> >
> > Arasu.M
> >
> >
> >
> >
> >
> >
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