Hi Andreas, Which card are you using to capture the screen? If you are using the Epiphan VGA2USB like we do it actually runs at a really low FPS, around 5ish. I would first try using gstreamer from the command line to show what you are capturing with something like
gst-launch v4l2src device=/dev/video1 ! xvimagesink or gst-launch v4lsrc device=/dev/video1 ! xvimagesink and see if you are getting the same bad FPS. If you do have a better card than this it might be that you are getting too many fps and so it can't keep up. In your /opt/matterhorn/conf/services/org.opencastproject.capture.impl.ConfigurationManager.properties file you can specify the framerate for each device like so: capture.device.SCREEN.framerate=15 Where SCREEN is the friendly name of your capture device. I would first try setting it to something like 30fps if you think the capture card can handle it and throttle it down to see what it can handle. If this doesn't seem to help try increasing your buffer size in the same config file like so: # Keep up to 200 frames in memory (at 5 fps, this is 2 minutes worth of data) capture.device.SCREEN.buffer.size=600 # Keep up to 512 megabytes of frames, roughly 200 frames at 1024x768 24bpp capture.device.SCREEN.buffer.bytes=536870912 # Keep up to 2 minutes of data capture.device.SCREEN.buffer.time=120000000000 Cheers, Adam On Wed, Feb 9, 2011 at 10:43 AM, shinymonk <[email protected]>wrote: > > Hi, > > Yipii ! I can now successfully record from my camera ! > What helped was to modify the PipelineFactory.getBluecherryPipeline() > method > like this: > (Class located in > > /opt/matterhorn/capture-agent/matterhorn-source/modules/matterhorn-capture-agent-impl/src/main/java/org/opencastproject/capture/pipeline/PipelineFactory.java) > ... > // added/modified the highlighted parts, by AK > fpsCaps = Caps.fromString("video/x-raw-rgb"); > fpsfilter.setCaps(fpsCaps); > > Element ffmpegcolorspace = ElementFactory.make("ffmpegcolorspace", > null); > > pipeline.addMany(v4l2src, queue, videorate, fpsfilter, > ffmpegcolorspace, > enc, muxer, filesink); > logger.info("Set rgb and colorspace by AK"); > ... > if (confidence) { > boolean trace = > > Boolean.valueOf(properties.getProperty(CaptureParameters.CAPTURE_CONFIDENCE_DEBUG)); > if (!VideoMonitoring.addVideoMonitor(pipeline, fpsfilter, > ffmpegcolorspace, interval, imageloc, device, trace)) { > logger.info("VideoMonitor wont match - AK"); > error = formatPipelineError(captureDevice, fpsfilter, > ffmpegcolorspace); > } > } else { > if (!fpsfilter.link(ffmpegcolorspace)) > error = formatPipelineError(captureDevice, fpsfilter, > ffmpegcolorspace); > } > if (!ffmpegcolorspace.link(enc)) > error = formatPipelineError(captureDevice, ffmpegcolorspace, enc); > > .... > > So, this part is solved after like 25 hours of research, trying and > failing, > but thats just the way is is. > Thanks again for your hints and tricks ! > > Btw. if my camera.mpg shows fine now (fluent), but my screen.mpg seems to > be > like on 2 pictures per second (sometimes), ie. the flow is usually not a > flow but sometimes a jump from picture to picture, what can I look at first > to detect/correct the cause, in your experience ? (example: > http://derpi.tuwien.ac.at/krieger/Screen.mpg ) > > Regards, Andreas > > > shinymonk wrote: > > > > Hi Greg, Adam, Ruben, > > > > Answers inline ;) > > > >>> The camera shows OK when starting VLC-Player after fresh boot of Ubuntu > >>> 10.4.1.LTS. > >>> Starting a simple capture results in a green capture with a very thin > >>> stripe > >>> on the top showing camera content (ie. contents change with the moving > >>> of > >>> the camera). > >>> And after that capture, VLC-Player won't display the camera anymore, > >>> instead > >>> we see the green picture described above. > >>This is a symptom of an incorrect standard setting (PAL vs NTSC) > > > >> When you installed the system, did it prompt you for the capture > >> standard? Which did you choose? > > I chose 5=PAL and 1=Composite0, and the file > > /opt/matterhorn/capture-agent/device_config.sh > > shows this, which I understand to be correct: > > > > #! /bin/bash > > v4l2-ctl -s 4 -d /dev/camera > > v4l2-ctl -d /dev/camera -i 0 > > > >>> To me it seems, that the capture client somehow modifies the v4l2 > >>> settings, > >>> since VLC shows OK before the capture, but bad after the capture. How > >>> can > >>> this be prevented or circumvented ? > > > >> So the card works correctly on bootup? There is a file at (by default) > >> /opt/matterhorn/capture-agent/device_config.sh which controls what the > >> camera is set to. If this file is blank then Matterhorn will not change > >> any v4l settings. > > > > The card works correctly directly after bootup, and even with matterhorn > > started (which happens on bootup): > > I can see video on VLC (v4l2://). > > But with starting a capture 2 things happen: > > 1. The capture is green (except for a thin line at the right upper corner > > showing moving content) > > 2. A subsequent call to VLC (v4l2://) also gives me a green picture. > > > > Only remedy atm is > > to switch over to NTSC (before capture) and then back to PAL (during > > capture) as mentioned in my previous post; then the capture will be all > > right (lest the few seconds in the beginngin NTSC was set) > > > > As posted in my answer to Ruben I confirm this to be Adam Mckenzie's > issue > > https://opencast.jira.com/browse/MH-5404, > > and hope for some soon fix/workaround. > > > > ATM I'm checking the matterhorn Trunk version, whether it does any > better, > > and will report on any success/failure. > > -> No, also green videos is all I see. Sigh. > > > > Greetings and lots of thanks for the detailed support and ideas, Andreas > > > > -- > View this message in context: > http://opencast.3480289.n2.nabble.com/Matterhorn-users-Problem-with-customProducer-in-capture-impl-configurationmanager-properties-tp5970958p6008507.html > Sent from the Matterhorn Users mailing list archive at Nabble.com. > _______________________________________________ > Matterhorn-users mailing list > [email protected] > http://lists.opencastproject.org/mailman/listinfo/matterhorn-users > -- Adam McKenzie MSc Student ARIES Laboratory, University of Saskatchewan Web: http://aries.usask.ca/aiwiki/Adam_McKenzie Mail: Advanced Research in Intelligent Educational Systems Laboratory Department of Computer Science University of Saskatchewan 176 Thorvaldson Building 110 Science Place Saskatoon, SK S7N 5C9
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