UTC timestamp into H.264 stream

[Nicolas Dufresne]

Le mardi 12 janvier 2016 à 02:29 +0100, Florian Langlois a écrit :
> Hmm actually i should inherit from GstBaseParse
> Le 12 janv. 2016 1:31 AM, "Florian Langlois" <chamois94 at gmail.com> a
> écrit :
> > Thx for the answer.
> > Can I simply inherit from GstBaseTransform and use the tracked
> > segment from it since it keeps a copy of it ?

From an element, you can't assume the application have setup the clock
the way you want. So instead, you'll have to translate from one clock
to UTC clock to get what you described earlier.

> > Le 12 janv. 2016 12:25 AM, "Nicolas Dufresne"
> > <nicolas.dufresne at collabora.com> a écrit :
> > > Le lundi 11 janvier 2016 à 23:24 +0100, Florian Langlois a
> > > écrit :
> > > > Hello,
> > > > For a project I need to insert UTC timestamps into a h.264
> > > stream
> > > > using the MISB ST 604.
> > > > I also need to insert Commercial precision timestamp detailled
> > > in the
> > > > same  MISB.
> > > > Frames are captured from a live source v4l2src then encoded
> > > using an
> > > > imx6 encoder and send with a udpsink.
> > > > Before to start I want to know if someone here has  any idea of
> > > what
> > > > would be a good pipeline architecture for that ?
> > > > I wanted to develop a dedicated plugin for that but i dont know
> > > how
> > > > to get correct UTC timestamp ? Do such a gstclock exist ?
> > > > Thx
> > > > Florian
> > > 
> > > You can grab the system clock and set the clock-type property to
> > > GST_CLOCK_TYPE_REALTIME (instead of default which is
> > > GST_CLOCK_TYPE_MONOTONIC). Then you need to force your pipeline
> > > into
> > > using that clock, see gst_pipeline_use_clock() method.
> > > 
> > > Note that to convert the buffer timestamp into clock time (UTC
> > > time),
> > > you will have to track the GstSegment structure from the segment
> > > event,
> > > convert the timestamp to running-time and add the pipeline base
> > > time
> > > (gst_element_get_base_time(pipeline)).
> > > 
> > > cheers,
> > > Nicolas
> > > _______________________________________________
> > > gstreamer-devel mailing list
> > > gstreamer-devel at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> > > 
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