I've used an external webcam before for a project, but it was a network camera that supported video streaming. I found it easiest to get it working in quicktime first - if you can get the stream playing in quicktime it should work in QC too, and quicktime removes the possibility that something else is wrong in your composition and you waste days thinking it's the camera.
What you have to do is get the UNC path for the video stream. For my camera it was rtsp://(ip address)/video.mp4 In quicktime you can test if the stream is compatible by going file->open location and adding the path there. Then in QC, you just feed that path to the Movie Importer. It'll show the quicktime logo while it connects and then start streaming. If you're recording, you'll want to remove the logo from the recorded output, and you'll want to detect + fix connection interruptions - this gave me huge headaches! The quicktime logo is in low resolution, so it's likely the output resolution will change when the actual streaming starts. That's easy to detect and handle. If there's a connection interruption (likely with a network camera!) then in some cases it'll automatically handle it, in others it'll just continue outputting the last frame forever. I handled this by using a 2-member queue and a core image filter to get the difference between the current and last frames (the filter is something like "output = abs(currentFrame - lastFrame)"). I then used the Area Maximum patch to get the highest value, and an Image Pixel to get the actual value. A video stream will always have a non-zero value, so if you detect a zero you can reset the movie importer (it has a Reset Signal that will restart the stream). Hope that helps a bit! Chris On 6 January 2012 11:02, Charlie Francis <charl...@cellcastonline.com> wrote: > Hi guys, > > I was just wondering if it's possible to be able to pull in an external > webcam stream and display it through quartz. I have tried to use Quicktime > Broadcaster, but I keep getting a connection error whenever I try and start > broadcasting. Windows users need to be able to broadcast to it as well. > > I've had a look through Kineme's forum but can't find anything helping me > display the stream. > > Thanks! > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/psonice%40gmail.com > > This email sent to pson...@gmail.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
