Hi, I've inserted the gst_base_src_set_format((GstBaseSrc*)fakesrc,GST_FORMAT_TIME); after creation  of the fakesrc element, and tried to make some timestamp issue in the callback: static void cb_handoff (GstElement *fakesrc,         GstBuffer  *buffer,         GstPad     *pad,         gpointer    user_data) {     static gboolean white = FALSE;     GTimeVal gtime;     g_get_current_time(&gtime);     GstClockTime gstClock=GST_TIMEVAL_TO_TIME(gtime);     buffer->timestamp=gstClock;     memset (GST_BUFFER_DATA (buffer), white ? 0xff : 0x0,       GST_BUFFER_SIZE (buffer));     white = !white;    } But the problems persists, there isn't a 1fps as set in the caps and cpu is still 100%. I can't understand how create a timestamp incremented 1 second by one with Glib, is there a way to do this? I wish to improve this example and then submit it the a future development of the manual. Thank's for any help. Regards. <div>2007/6/5, Tim Muller <<a href="mailto:t.i.m@zen.co.uk"> t.i.m@zen.co.uk</a>>:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Riccardo Corona <<a href="mailto:coronariccardo@gmail.com"> coronariccardo@gmail.com</a>> wrote : > Hi,I've tried the fakesrc example from <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-data-spoof.html">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-data-spoof.html </a> > it works well and display black & white images but it also > use all the cpu.Is there a way to avoid this > behaviour? Two problems here: (a) fakesrc will send a newsegment event in BYTES format,      not TIME format (which you could probably work around      by using gst_base_src_set_format() after creating the      fakesrc element (needs linking against libgstbase-0.10). (b) the example doesn't set timestamps on the buffers it      pushes out in the handoff callback. Probably not really a very good example :) Cheers -Tim </blockquote></div> -- Riccardo Corona