On Wednesday 26 August 2009 10:42:14 Rogier Wolff wrote: > On Wed, Aug 26, 2009 at 09:26:16AM +0100, Paulo Assis wrote: > > Logitech is actually very supportive for linux, please check: > > http://forums.quickcamteam.net/ > > > > there is a linux section were you can get some feedback on logitech > > webcams under linux. > > Yeah. They are playing nice now. But it is partly at least a charade. > > The "frame rate matrix" hasn't been updated for a year and a half. > > > > The cameras have marketing specs of "video up to 1280x1024", and > > > "frame rates up to 30 fps". I can of course accept that it's possible > > > to run at lower framerates and framesizes. But my experience is that > > > when they formulate it like this, the camera can't do 1280x1024 at > > > 30fps... Do you have hints that this camera is capable of > > > 1280x1...@30fps? > > > > You are reading this wrong! > > There is no direct relation between the presented max frame rate and > > the max resolution, for 1280x1024 you can only get ~5 fps but for > > lower resolutions the max frame rate is 30 fps. > > This is indeed what some cameras have. But 1.3Mpixel is well below HD > video. And HD video is available in consumer grade cameras, so why not > in a webcam?
Technically speaking, 1280x720, which is a bit less than 1MP, is considered as HD video. > Consumer grade HD video cameras manage to squeeze 1 hour on 2Gb of SD > card. This comes to 555 kbytes per second. That's well within reach > for transfer over USB. I honestly think that this is way too little > bandwidth for decent HD video, but even if you multipy that by 10, the > amount of data is well within reach for USB2.0. That's another story. There is currently no webcam that I'm aware of that support MPEG4 compression in hardware. > These might be able to do it, but may be expensive: > > http://www.engadget.com/2009/08/18/microsofts-lifecam-cinema-hd-webcam-lets >-you-film-those-youtube/ > > http://www.digitaltechnews.com/news/2006/07/logitech_quickc.html -- Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
