<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Thanks for your answer. So, I won't use videorate any more. I think I'll calculate the probability that a frame can be dropped based on qos event, cause I'm comparing the effection of difference codecs. Do you think is there any thing else that I should get ? P/S: I also get jitter and frame rate. Thanks and best regards. trungnt --- Ngày Thứ 4, 29/07/09, Tim-Philipp Müller <t.i.m@zen.co.uk> đã viết: <blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"> Từ: Tim-Philipp Müller <t.i.m@zen.co.uk> Chủ đề: Re: [gst-devel] Help with videorate and qos usage Đến: gstreamer-devel@lists.sourceforge.net Ngày: Thứ Tư, 29 tháng 7, 2009, 16:17 <div class="plainMail">On Tue, 2009-07-28 at 22:01 -0700, Nguyen Thanh Trung wrote: > Hi, I'm new here, and I want to ask something about gstreamer: > > I'm working with a gstreamer application to get the number of dropped > frames from a video stream. I use videorate to get the value. But, the > result is alway 0, no matter what I tried. > > The gstreamer qos document says that qos is enabled by default for > video, so why I did not get any dropped frame ? > > I wrote an event prob function to put after the video decoder and > found that there's many frame have positive jitter (the diff value got > from gst_event_parse_qos()) but they are still not dropped event I set > max_lateness for video sink to 100. The drop property on videorate will only tell you how many frames videorate dropped in the process of trying to convert the upstream framerate / input stream to the desired downstream framerate (usually configured by using a capsfilter after the videorate element). It does not really handle or take into account QoS-related things at all. It merely tries to create a perfectly timestamped/spaced output stream according to the desired output framerate. If you have a decoder upstream that handles QoS events and skips the decoding of some frames, videorate most likely will just fill the gaps with duplicate frames (which would then later be dropped again by the sink because they're too late). I don't think we have a way to query this kind of information at the moment. There's a bug for it though: <a href="http://bugzilla.gnome.org/show_bug.cgi?id=353680" target="_blank">http://bugzilla.gnome.org/show_bug.cgi?id=353680</a> Cheers   -Tim ------------------------------------------------------------------------------ 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 ymailto="mailto:gstreamer-devel@lists.sourceforge.net" href="/mc/compose?to=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> </div></blockquote></td></tr></table> <hr size=1> Tốt hơn, thoáng gọn hơn, nhanh hơn - <a href="http://vn.mail.yahoo.com"> Trải nghiệm Yahoo! Mail mới hôm nay! </a>