Hi, Thanks for the clarifications. <div class="gmail_quote">On Sat, Aug 6, 2011 at 1:48 PM, Edward Hervey <<a href="mailto:bilboed@gmail.com">bilboed@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Hi, <div class="im"> On Fri, 2011-08-05 at 17:11 +0530, vineeth wrote: > Hi, > I wanted to know the difference between "duration" and > "media-duration" in GnlObject and I couldn't comprehend this clearly > from the documentation. </div> Duration is for how long something will be played from the outside. Media-duration is how long you're taking from the contained media. 99.99% of the time you want media_duration == duration. If you want a source to play faster/slower (without any extra cost), you can modify those values accordingly. Ex : I want to playback an intro video two times slower. That video is originally 3s: media_duration = 3s duration = 6s The rate is computed from the duration/media_duration values automatically, it's just provided as a convenience. <div class="im"> > If I want the Gnl pipeline to render at a faster rate, (but without > changing the timestamp of sources) which property should I change? I > read that rate is a read-only property. </div> You can either: * Seek with a rate of 0.5 if you just want to play it back slower * OR you'll have to modify all the source duration/media_duration values accordingly. </blockquote><div> </div><div>I was trying a mp4 (with h264) trim on 0.10.32 When the duration was made half of media-duration, I was expecting the pipeline to run faster, however, I didn't see any significant change in save time (compared to case where duration and media-duration are same). for ex: gst-launch gnlcomposition { gnlfilesource name="s1" location="/mnt/hgfs/ubuntu_shared/h264/4.mp4" start=0 duration=10000000000 media-start=0 media-duration=10000000000 } ! ffmpegcolorspace ! x264enc ! mp4mux ! filesink location="/mnt/hgfs/ubuntu_shared/output-d-10-md-10.mp4" Time take : ~41 seconds gst-launch gnlcomposition { gnlfilesource name="s1" location=/mnt/hgfs/ubuntu_shared/h264/4.mp4 start=0 duration=5000000000 media-start=0 media-duration=10000000000 } ! ffmpegcolorspace ! x264enc ! mp4mux ! filesink location=/mnt/hgfs/ubuntu_shared/output-d-5-md-10.mp4 Time take : ~41 seconds Our intention is to speed up the gnl pipeline so that the media content is saved faster. Is there anything missing / incorrect in the above pipeline? </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Edward > Thanks. > --vineeth > _______________________________________________ > 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> </blockquote></div>