Hello Hans, I am using your libv4l 0.6.0 [1] together with the driver gspca_pac7311 from Linux kernel 2.6.31-rc4 and with Labtec Webcam 2200 hardware [2]. I am using the svv.c [3] to display the webcam image. When I'm using the webcam in 640x480 the image is displayed correctly. However, when I set the resolution to 320x240, the image is not correct: the image contains horizontal lines and doubled vertically. I guess the conversion from 640x480 is not done just the pixels are shown as it would be 320x240. $ ./svv -f 320x240 raw pixfmt: PJPG 640x480 pixfmt: RGB3 320x240 mmap method What do you think the problem could be? References: [1] libv4l http://freshmeat.net/projects/libv4l [2] Labtec Webcam 2200 http://labtec.com/index.cfm/service/listing/EUR/EN,crid=68,crid2=1764 [3] svv.c http://moinejf.free.fr/svv.c $ v4l-info ### v4l2 device info [/dev/video0] ### general info VIDIOC_QUERYCAP driver : "pac7311" card : "USB Camera (093a:2626)" bus_info : "usb-0000:00:10.1-1" version : 2.6.0 capabilities : 0x5000001 [VIDEO_CAPTURE,READWRITE,STREAMING] standards inputs VIDIOC_ENUMINPUT(0) index : 0 name : "pac7311" type : CAMERA audioset : 0 tuner : 0 std : 0x0 [] status : 0x0 [] video capture VIDIOC_ENUM_FMT(0,VIDEO_CAPTURE) index : 0 type : VIDEO_CAPTURE flags : 0 description : "PJPG" pixelformat : 0x47504a50 [PJPG] VIDIOC_G_FMT(VIDEO_CAPTURE) type : VIDEO_CAPTURE fmt.pix.width : 640 fmt.pix.height : 480 fmt.pix.pixelformat : 0x47504a50 [PJPG] fmt.pix.field : NONE fmt.pix.bytesperline : 640 fmt.pix.sizeimage : 115790 fmt.pix.colorspace : JPEG fmt.pix.priv : 0 controls VIDIOC_QUERYCTRL(BASE+0) id : 9963776 type : INTEGER name : "Brightness" minimum : 0 maximum : 32 step : 1 default_value : 16 flags : 0 VIDIOC_QUERYCTRL(BASE+1) id : 9963777 type : INTEGER name : "Contrast" minimum : 0 maximum : 255 step : 1 default_value : 127 flags : 0 VIDIOC_QUERYCTRL(BASE+2) id : 9963778 type : INTEGER name : "Saturation" minimum : 0 maximum : 255 step : 1 default_value : 127 flags : 0 ### video4linux device info [/dev/video0] ### general info VIDIOCGCAP name : "USB Camera (093a:2626)" type : 0x1 [CAPTURE] channels : 1 audios : 0 maxwidth : 640 maxheight : 480 minwidth : 48 minheight : 32 channels VIDIOCGCHAN(0) channel : 0 name : "pac7311" tuners : 0 flags : 0x0 [] type : CAMERA norm : 0 tuner ioctl VIDIOCGTUNER: Invalid argument audio VIDIOCGAUDIO audio : 0 volume : 0 bass : 0 treble : 0 picture VIDIOCGPICT brightness : 32768 hue : 0 colour : 32639 contrast : 32639 whiteness : 0 depth : 8 palette : unknown buffer ioctl VIDIOCGFBUF: Invalid argument window VIDIOCGWIN x : 0 y : 0 width : 640 height : 480 chromakey : 0 flags : 0 Regards, Márton Németh -- 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
