UTC timestamp into H.264 stream

[Florian Langlois]

yes, my thought was to create the pipeline, set the system clock in
REALTIME and develop a GstBaseParse element to insert NAL SEI Unregistered
with the timestamp into the H.264 stream.

Bad idea ?

2016-01-12 4:26 GMT+01:00 Nicolas Dufresne <nicolas.dufresne at collabora.com>:

> 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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