Hi Oliver, On Tue, 17 Mar 2015, Oliver Lehmann wrote: > Hi, > > I'm using v4l2 on FreeBSD but I hope this doesn't matter that much. > I got a new MS LifeCam Studio HD which makes quite good pictures > because of its focus possibilites. > > When I use the original software provided by MS the "autofocus" > feature works damn good. With v4l2, autofocus is enabled but it > just does not focus. Disabling autofocus and setting focus manually > does work (and in my case this is sufficient) > > Another point is, that this cam can record pictures with 8 megapixel > which results in 3840x2160 image files. This "8MP mode" and the 1080p > mode is only available for snapshot pictures. The highest resolution > supported for videos is 720p. I'm not sure I can help, at least definitely not until I know details. But in either case I'd be interested to know details of this camera. Can you find out what driver is serving it, what standard it is? Looking at the Microsoft so veeeery "technical" data sheet it says, it is compatible with Android. So, it hints at it being a UVC camera. As for the actual question, I have no idea how they implement still images: the UVC standard defines two methods for higher-resolution still image capture: either using the "still image trigger control" or a dedicated bulk pipeline (and a hardware button if there is one on your camera?) FWIW, in either case I'm not sure whether the driver supports any of those methods. I think bulk pipe support has been added to it at some point, but what concerns switching... Not sure really, sorry. But if you just try to be opportunistic and try cheese - it has a separate setting for still images, so, maybe I'm way behind the time and everything is working already? Thanks Guennadi > All I want is recording snapshot images and I do not need the video > capability at all. > > I wonder how I can capture those big 8MP images? With mplayer I'm > only able toe capture 720p at max. I guess because mplayer just > accesses the video mode and takes a single frame. > > mplayer tv:// -tv driver=v4l2:device=/dev/video0:width=1280:height=720 -frames > 1 -vo jpeg > > I wonder if there is a possibility to access the cam in the > I-call-it-snapshot-mode to take single pictures with higher resolutions? > > Regards, Oliver > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
