Problems with sink elements not going into playing state
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Problems with sink elements not going into playing state
 
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Hi Everybody,
For the past two weeks I've been taking my first stabs at developing a webcam app with GStreamer. I got the display part of it working just fine. But, the problems start when I try to implement recording. Basically I have a pipeline that connects a v4l2src, an ffmpegcolorspace, a tee, and an xvimagesink for the display. The problem comes in when I try to connect the recording elements (theoraenc, oggmux, and filesink) to my setup with the tee. What happens is the pipeline just stops; I only get one frame of video, if anything at all, from the display and an empty .ogg file. After some long debugging sessions I found that the filesink was the culprit; everything else was doing its job, but this element, and strangely the image sink, never completes the state change from paused to playing, while all the other elements do. In fact, when I set the debug level to 5 it shows me some of the Theora data that the pipeline produces. Even more strangely, when I stop recording and go back to display only, the display resumes again. I played with gst-inspect a little and found out that I could reproduce the problem with this pipeline: gst-launch v4l2src ! video/x-raw-yuv,width=640,height=480 ! ffmpegcolorspace ! xvimagesink . fakesink But if I just do gst-launch v4l2src ! video/x-raw-yuv,width=640,height=480 ! ffmpegcolorspace ! xvimagesink Everything works fine. I also have a test program (attached) that uses videotestsrc and fakesink, and it shows the same problem. If I introduce more than one sink into my pipeline, all the sinks get stuck in the paused state. It doesn't even have to be connected to anything, it just has to be in the pipeline, and it'll bring the whole thing down. Is this a known problem, or am I just doing something wrong, being a total GStreamer newbie? To compile the test program, do: gcc gst-test.c `pkg-config gstreamer-0.10 gstreamer-plugins-base-0.10 gtk+-2.0 --cflags --libs` -lgstinterfaces-0.10 -o gst-test Note that you'll have to enable the part that adds the fakesink to the pipleine to see the problem; with it disabled everything seems to work. This is on Ubuntu Gutsy with gstreamer 0.10.14 packages. I also tried compiling .15 from source; it gives the same results. Thanks in advance for you help. Also, please CC me as I'm not subscribed here. Thanks again, James Liggett ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
gst-test.c (2K)
Re: Problems with sink elements not going into playing state
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