<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><title id=ridTitle>Blank</title><style></style><![if mso 9]><style>p.MsoNormal {margin-left:18.75pt;} </style><![endif]></head><body bgcolor=white background="cid:image001.gif@01CC569F.8B516D60" lang=EN-US link=blue vlink=purple style='margin-left:18.75pt;margin-top:18.75pt' id=ridBody><img src="cid:image001.gif@01CC569F.8B516D60" v:src="cid:image001.gif@01CC569F.8B516D60" v:shapes="_x0000_Mail" width=0 height=0 class=shape style='display:none;width:0;height:0'><div class=WordSection1>If you preview/play using gstreamer, here are few sample commands you could use:<o:p></o:p>gst-launch-0.10 v4l2src device=/dev/video1 ! autovideosink<o:p></o:p>gst-launch-0.10 v4l2src device=/dev/video0 ! xvimagesink<o:p></o:p><pre>gst-launch-0.10 v4l2src device=/dev/video0 ! 'image/jpeg, width=640, height=480, framerate=30/1' ! jpegdec ! xvimagesink<o:p></o:p></pre><o:p> </o:p>Also the "Webcam and Linux-GStreamer Tutorial" is at:<o:p></o:p><a href="http://www.twm-kd.com/linux/webcam-and-linux-gstreamer-tutorial/">http://www.twm-kd.com/linux/webcam-and-linux-gstreamer-tutorial/</a><o:p></o:p><o:p> </o:p>Other Linux Players/Apps include:<o:p></o:p>Mplayer:                     <a href="http://www.mplayerhq.hu/design7/news.html">http://www.mplayerhq.hu/design7/news.html</a><o:p></o:p>VLC:                               <a href="http://www.videolan.org/vlc/download-sources.html">http://www.videolan.org/vlc/download-sources.html</a><o:p></o:p>TVtime:                        <a href="http://tvtime.sourceforge.net/">http://tvtime.sourceforge.net/</a><o:p></o:p>XawTV:                  <a href="http://www.kraxel.org/blog/linux/xawtv/">http://www.kraxel.org/blog/linux/xawtv/</a><o:p></o:p>all play from a v4l/v4l2 device including webcam.<o:p></o:p>Best Regards,<o:p></o:p>Charlie X. Liu, Ph.D.<o:p></o:p>Sensoray Company Inc.<o:p></o:p><o:p> </o:p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>From: gstreamer-devel-bounces+charlie=sensoray.com@lists.freedesktop.org [mailto:gstreamer-devel-bounces+charlie=sensoray.com@lists.freedesktop.org] On Behalf Of Steve Cookson Sent: Friday, August 05, 2011 7:53 AM To: gstreamer-devel@lists.freedesktop.org Subject: Webcam URI<o:p></o:p></div></div><o:p> </o:p>Hi Guys,<o:p></o:p>I'm hoping you can help me.<o:p></o:p>I am writing a medical video application for live surgical examinations, eg for endoscopies or laparoscopies. The application is written in wxPerl which uses an API called wxMediaCtrl as a GStreamer front end.<o:p></o:p>The C++ code is shown here:<o:p></o:p><a href="http://read.pudn.com/downloads69/sourcecode/embed/247385/wxWidgets-2.8.0/src/unix/mediactrl.cpp__.htm">http://read.pudn.com/downloads69/sourcecode/embed/247385/wxWidgets-2.8.0/src/unix/mediactrl.cpp__.htm</a><o:p></o:p>While the video playback from a file works fine, the functionality for playing a webcam (wxGStreamerMediaBackend::Load (URI version)) does not. It seems that the webcam is opened/loaded but no image appears.  If I use a valid webcam name, I get no reaction, but if I use an invalid webcam name the application crashes.  I am trying to track the API calls through mediactrl.cpp which starts with this call, but should there be the equivalent of "play" for a webcam?<o:p></o:p>Does anyone have or can you point me to a piece of Linux c++ code that plays a Linux webcam (eg <a href="file:///\\dev\video0">file:///dev/video0</a>)?<o:p></o:p>Any code or other advice would be much appreciated<o:p></o:p>Regards Steve<o:p></o:p><div> <o:p></o:p></div></div></body></html>