Thanks for your response, the idea behind this is for subtitles. I'll give a try, I am very clueles as new on this, so I couldn't get the scope of these plugins. I'll write back with some result. Regards Rossana <div class="gmail_quote">2011/11/21 Thibault Saunier <<a href="mailto:thibault.saunier@collabora.com">thibault.saunier@collabora.com</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Hello, Have you tried using the Gstreamer Editing Services to do that? Transitions and text overlay are supported already: *<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/GESTimelineTextOverlay.html" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/GESTimelineTextOverlay.html</a> *<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/GESTimelineStandardTransition.html" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/GESTimelineStandardTransition.html</a> I know it is not really the answer to your technical question but GES seems to be best suited for this particular problem. Also as GES is built upon gnonlin, you could have a look at the code to see how we handle that. Regards, Thibault Saunier <div><div class="h5"> On Mon, 2011-11-21 at 18:03 -0200, Rossana Guerra wrote: > Hello, I have a Gnlcomposition with 2 gnlfilesources (videofiles), I > need to render text in a customizable manner. For instance, at certain > time file1 needs text over it and file2 doesn't and viceversa or even > both could need the text rendered over them. > I could put a text in the common queue, so it always appears and it > isn't the needed behavior. > > I appreciate any clue, thanks > > Rossana > > > The pipeline > > > GnlComposition > > gnlfilesource1 > > --------------------gnlOperarion--------queue-----sink // I put > the textoverlay between the queue and the sink > gnlfilesource2 > > > gnlOperation //for crossfade purposes > > alpha1 > ----------videomixer--------ffmpegcolor > alpha2 > > > </div></div>> _______________________________________________ > 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>