Hi, 2010/4/6 Franz TRIERWEILER <franz.trierweiler.ingeni...@gmail.com>: > Hi Paulo, > > First many thanks for your answer. > > I have doubts about using Usb1 ou Usb2 port... I asked Freescal in order to > make sure but according to the IMX datasheet, it is a USB 2.0 port. > > What annoys me is that I read: "usb 1-1: not running at top speed; connect > to a high speed hub" and I do not know how to understand this. > > usb 1-1: not running at top speed; connect to a high speed hub > usb 1-1: New USB device found, idVendor=0c45, idProduct=62c0 > usb 1-1: New USB device strings: Mfr=2, Product=1, SerialNumber=0 > usb 1-1: Product: USB 2.0 Camera > usb 1-1: Manufacturer: Sonix Technology Co., Ltd. > usb 1-1: configuration #1 chosen from 1 choice > uvcvideo: Found UVC 1.00 device USB 2.0 Camera (0c45:62c0) > input: USB 2.0 Camera as /class/input/input2 >
That's definitely a usb1.1 connection (full speed) since the camera device is usb2 (high speed) you get that type of message. > If it is not a USB 2.0 port, is there a way through gst-launch to reduce the > image resolution ? > I don't think resolution is the only issue here. Usually uvc devices support two types of video stream, compressed MJPG or/and uncompressed YUYV, when connected to a slower usb port they just drop the uncompressed format and support MJPG only and at lower fps/resolutions. I've actually never tried a YUYV camera only on a usb1 port so I'm not sure how this is handled in that case, but most likely it will drop support for higher resolutions. GStreamer I think defaults to yuv so you should also try setting the input format to MJPG, e.g.: gst-launch v4l2src ! image/jpeg,width=320,framerate=15/1,rate=15 You can use guvcview or luvcview to check out available formats and resolutions for the camera in the ARM platform. Best regards, Paulo _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
