Timestamp problem...

[Eric Trousset]

I managed to fix my media playback issue, and now my src has a clock. I just added a bus watch.

So now I am just missing the base_time.

Eric T.

> -----Original Message-----
> From: Eric Trousset [mailto:etrousset at awox.com]
> Sent: mercredi 27 novembre 2013 11:51
> To: Discussion of the development of and with GStreamer
> Subject: RE: Timestamp problem...
> 
> Hi,
> 
> Yes my element is in a pipeline.
> 
> What I do is that  I create mySrcElement, the videomixer and the
> autovideosink in a GstBin. Link them together.
> 
> Then I create a pipeline, add the bin to the pipeline, and then set the pipeline
> to GST_STATE_PLAYING.
> 
> This should display the image I generate in my src, (caps are "video/x-raw,
> width=640, height=400, format=ARGB"); The first one is displayed, but then
> when I update my resource and unblock my create function, it seems the
> image is droped.
> 
> If I add a pad to the bin and link it to the videomixer, and set the bin as a
> video-sink of my playbin, then the pipeline doesn't play, (only the first frame
> is displayed, and we can ear about 1sec of sound) But if I remove, my src
> element, the media plays fine.
> 
> So it looks like I do something wrong in my srcElement, but can't figure out
> what?
> 
> In my src alement :
> - in _init() I set the format to GST_FORMAT_TIME, and set do_timestamp to
> TRUE,
> - in set_property() when I get my resource, I set the blocksize to the width *
> height * 4, and set the call gst_base_src_set_caps with a new caps
> - in _dispose(), I release my resource
> - in get_caps() I return the current caps of my resource
> - in create() : wait for my resource to update, allocate the buffer, fill the
> buffer, try to timestamp it like this :
> 		GST_BUFFER_PTS(*buf) =
> GST_ELEMENT_CLOCK(src)?gst_clock_get_time(GST_ELEMENT_CLOCK(src))
> - gst_element_get_base_time(GST_ELEMENT(src)) : 0;
> 
> Am I missing some important point here?
> 
> Regars,
> Eric T.
> 
> 
> 
> 
> > -----Original Message-----
> > From: Sebastian Dröge [mailto:sebastian at centricular.com]
> > Sent: mercredi 27 novembre 2013 10:57
> > To: Discussion of the development of and with GStreamer
> > Subject: Re: Timestamp problem...
> >
> > On Mi, 2013-11-27 at 10:32 +0100, Eric Trousset wrote:
> > > Hi,
> > > It looks like my source element never gets a clock, nor is its base_time
> set.
> > >
> > > Should I provide the clock myself (maybe when receiving the
> > > new_clock
> > message on the bus)?
> >
> > No, GstPipeline and GstBin does all that for you in theory. Is your
> > element inside a GstPipeline, and you set the complete pipeline to
> PLAYING state?
> >
> > You'll receive the new-clock message on the bus after the pipeline has
> > decided on a clock. If you get that message, you should have a clock
> > in your element.
> >
> > > Where would it be best to save the base_time? I tried in the start
> > > method
> > but it seems the pipeline clock can change afterward.
> >
> > You should get the base_time immediately before using it in
> > calculations, it could change. Same goes for the clock.
> >
> > --
> > Sebastian Dröge <sebastian at centricular.com> Centricular Ltd -
> > http://www.centricular.com Expertise, Straight from the Source
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