<div class="gmail_quote">2009/8/25 Wim Taymans <<a href="mailto:wim.taymans@gmail.com">wim.taymans@gmail.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="im">On Tue, 2009-08-25 at 16:40 +0200, Julien Isorce wrote: > Hi, > > I attach to this mail a minimal test to provide a gstreamer behaviour > that I do not understand. > > Actually, I would like to know why the clock can be not set yet > whereas some buffers are dispatched. > I mean I put an identity element between a videotestsrc and a > fakesink, > and I am checking the clock availability in the identity handoff > callback. > > Why am I able to get raw video buffers from handoff callback whereas > no clock is set on identity yet ? > Moreover in this case the timestamp buffer is valid, but I assume this > timestamp was set by the internal clock. > I can understand that the internal clock was already there before > playing, > and I can also understand that the internal clock is affected on > elements only when going to playing state (or at least ready). > But I think the clock should be always available from a handoff > callback, at least if the buffer timestamp is valid. > </div>The first buffer is part of preroll in PAUSED. It is only after all sinks receive a buffer that a clock is selected and the pipeline is set to PLAYING.</blockquote><div> ok thx for the explanation. In a more complex pipeline, it can take some times before all sinks receive a buffer. And so an element can receive a lot of buffers before all elements received a buffer ? I mean a lot of handoff calls with no access to the clock inside the callback. It could explain the behavior I have there in a use case. Anyway, I assume i should consider the buffers only after that playing state is reached. Sincerely Julien </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Wim <div class="im"> > ( to compile the test: gcc -Wall $(pkg-config --cflags --libs > gstreamer-0.10) main.c -o main ) > > (output: > > identity has clock: 0, timestamp is valid: 1 > pipeline is now playing > new clock set from: pipeline > identity has clock: 1, timestamp is valid: 1 > identity has clock: 1, timestamp is valid: 1 > identity has clock: 1, timestamp is valid: 1 > identity has clock: 1, timestamp is valid: 1 > identity has clock: 1, timestamp is valid: 1 > identity has clock: 1, timestamp is valid: 1 > identity has clock: 1, timestamp is valid: 1 > identity has clock: 1, timestamp is valid: 1 > identity has clock: 1, timestamp is valid: 1 > End of stream > > ) > > Sincerely > > Julien </div>> ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. <a href="http://p.sf.net/sfu/bobj-july" target="_blank">http://p.sf.net/sfu/bobj-july</a> > _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. <a href="http://p.sf.net/sfu/bobj-july" target="_blank">http://p.sf.net/sfu/bobj-july</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div>