Need to set a clock in gstreamer pipeline that are comaprable to PTS values.

[Sebastian Dröge]

On Sa, 2013-12-07 at 14:05 -0800, Cigarah wrote:
> What is method by which position is calculated. Is it like looking at the
> last buffer sample PTS which was played or a similar scenario.
> 
> So position is a possitive value between 0 and the duration. and what if the
> duration is not available. How is position calculated then
> 
> 
> I am streaming media over server and hence the duration is not known. Also
> seek is performed so How can the position be maintained in absolute terms.
> Because if I go back/forth in the video position it should correctly capture
> the time setting to same value when played from the same position
> 
> How is this maintained ?

You might want to read about how synchronization and time works in
GStreamer in the docs, and/or watch this talk about it from the
GStreamer conference. That should answer most of your questions already.

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-queryevents.html
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-clocks.html

http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/design/part-synchronisation.txt

http://gstconf.ubicast.tv/videos/time-and-synchronization-for-dummies-yesyou/


But in general, the position is calculated from what the streaming
protocol, container format or whatever provides as position, or when the
frame was captured for live streams.

-- 
Sebastian Dröge, Centricular Ltd - http://www.centricular.com
Expertise, Straight from the Source
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