Other people on the forum have more experience with this card than I. This seems like a pixel format compatibility issue. First, try this: export GST_DEBUG=v4l2src:4,GST_PADS:4 Then run your test. This will generate a lot of debugging output and will list the capabilities that your card is advertising. You can then compare those caps to v4l2src (gst-inspect v4l2src) and see the issue. Also, report the version of gstreamer and the other libraries that you are using. Another strategy is to use the v4l2 utilities (v4l2-ctl) to communicate directly with the BT878 driver. You can query and ever set supported modes. <div class="gmail_quote">On Mon, Jan 28, 2013 at 11:21 PM, Ramberg <<a href="mailto:andyr@paulbunyan.net" target="_blank">andyr@paulbunyan.net</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello, I'm a total newbie with Gstreamer and I'd really appreciate some help with a problem I'm having. I'm trying to duplicate my Hauppauge BT878 WINTV input (/dev/video0) to my video4linux loopbacks (/dev/video1 & /dev/video2). A test source works fine, ie. "gst-launch -v videotestsrc ! v4l2sink device=/dev/video1" but when I try my video card input ie. "gst-launch v4l2src device=/dev/video0 ! queue ! ffenc_mpeg2video bitrate=2000000 ! mpegtsmux ! v4l2sink sync=true device=/dev/video1" it fails to sync up... Output: Setting pipeline to PAUSED ... libv4l2: error getting pixformat: Invalid argument Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock ERROR: from element /GstPipeline:pipeline0/MpegTsMux:mpegtsmux0: Failed writing output data to stream 00e0 Additional debug info: mpegtsmux.c(964): mpegtsmux_collected (): /GstPipeline:pipeline0/MpegTsMux:mpegtsmux0 Execution ended after 100970739 ns. Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Newbie-With-v4l2sink-v4l2loopback-Problem-tp4658192.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Newbie-With-v4l2sink-v4l2loopback-Problem-tp4658192.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ 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>