<div dir="ltr"><div>Yeah, as far as I know, there really isn't a clean way to discard the first n seconds of a source via cli. The best I can think of is to use multifilesink, but that could be really awkward to get working. </div>I'm afraid you'll need to use python. <div> </div></div><div class="gmail_extra"> <div class="gmail_quote">On Wed, Jun 5, 2013 at 10:00 AM, a b <<a href="mailto:genericgroupmail@gmail.com" target="_blank">genericgroupmail@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thank you very much Angel, Really appreciate your input on this! <div class="HOEnZb"><div class="h5"> On Wed, Jun 5, 2013 at 2:40 PM, Angel Martin <<a href="mailto:amartin@vicomtech.org">amartin@vicomtech.org</a>> wrote: > If you prefer the probe method this links could help you: > <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-dataaccess.html" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-dataaccess.html</a> > <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-dynamic-pipelines.html" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-dynamic-pipelines.html</a> > > If you prefer a output-selector this one (ossbuild example): > <a href="http://code.google.com/p/ossbuild/source/browse/trunk/Main/GStreamer/Source/gst-plugins-bad/tests/icles/output-selector-test.c?r=926" target="_blank">http://code.google.com/p/ossbuild/source/browse/trunk/Main/GStreamer/Source/gst-plugins-bad/tests/icles/output-selector-test.c?r=926</a> > > > > 2013/6/5 a b <<a href="mailto:genericgroupmail@gmail.com">genericgroupmail@gmail.com</a>> >> >> Hi Angel, >> >> Thanks for the quick reply! >> So sounds like these methods are for programming a solution. >> I had planned to look into the python pygst module in order to get >> away from relying on executing system calls to gst-launch. Maybe now >> is the time to do that. >> >> Cheers! >> >> >> On Wed, Jun 5, 2013 at 12:52 PM, Angel Martin <<a href="mailto:amartin@vicomtech.org">amartin@vicomtech.org</a>> >> wrote: >> > Hi, >> > >> > Check valve gst element or the probes to check the buffers timestamp to >> > drop >> > or pass the buffer. >> > >> > Best, >> > >> > Angel >> > >> > 2013/6/5 a b <<a href="mailto:genericgroupmail@gmail.com">genericgroupmail@gmail.com</a>> >> >> >> >> Hi all, >> >> >> >> I have an issue with capturing a single snapshot from one particular >> >> device. >> >> Very often when starting to stream from one of our capture cards using >> >> the decklinksrc element the first few seconds of video are badly >> >> tuned/rendered before things finally correct themselves and the video >> >> appears normal. >> >> The way in which i am taking a screen shot means that the first video >> >> frame is output to an image file, which for this device means a very >> >> poor snapshot. >> >> There is no issue with the v4l2src capture cards as the first frame is >> >> always perfectly tuned/rendered. >> >> >> >> Here is how i am doing it: >> >> >> >> gst-launch decklinksrc mode=2 connection=4 ! ffmpegcolorspace ! >> >> video/x-raw-rgb ! pngenc snapshot=true ! filesink location="frame.png" >> >> >> >> Is there anyway or any element i can use to drop the first few seconds >> >> of video or the first e.g. 90 frames before taking the snapshot? >> >> I had read about the valve element and played with it but didn't see >> >> how it was going to work (for a start it causes execution to block). >> >> Ideally I'd like the command to run and finish with no further >> >> interaction as it does at the moment. >> >> If there is no real way to do it via a command line, then it would be >> >> useful if anyone could point to a way to do it programatically via >> >> python. >> >> >> >> Thanks in advance. >> >> _______________________________________________ >> >> gstreamer-devel mailing list >> >> <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> >> >> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> >> > >> > >> > >> > _______________________________________________ >> > gstreamer-devel mailing list >> > <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> >> > <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> >> > >> _______________________________________________ >> gstreamer-devel mailing list >> <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> >> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> > > > > _______________________________________________ > gstreamer-devel mailing list > <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> > <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> > _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </div></div></blockquote></div> -- Stirling Westrup Programmer, Entrepreneur. <a href="https://www.linkedin.com/e/fpf/77228" target="_blank">https://www.linkedin.com/e/fpf/77228</a> <a href="http://www.linkedin.com/in/swestrup" target="_blank">http://www.linkedin.com/in/swestrup</a> <a href="http://technaut.livejournal.com" target="_blank">http://technaut.livejournal.com</a> <a href="http://sourceforge.net/users/stirlingwestrup" target="_blank">http://sourceforge.net/users/stirlingwestrup</a> </div>