Franz Hi, 2010/4/6 Franz TRIERWEILER <franz.trierweiler.ingeni...@gmail.com>: > Hello, > > I am trying to make jpeg/png still encoded picture from a uvcvideo > compatible webcam with gstreamer. I do this on a Freescale iMX25 evalboard > featuring support for the uvcvideo driver. > > I configured the gstreamer package and v4l2 / uvc support properly through > LTIB. > > My webcam is officialy supported (0c45:62c0) by the Linux UVC driver. > indeed, here is what I get when plugging the device: > > usb 1-1.5: new full speed USB device using fsl-ehci and address 5 > usb 1-1.5: not running at top speed; connect to a high speed hub > usb 1-1.5: New USB device found, idVendor=0c45, idProduct=62c0 > usb 1-1.5: New USB device strings: Mfr=2, Product=1, SerialNumber=0 > usb 1-1.5: Product: USB 2.0 Camera > usb 1-1.5: Manufacturer: Sonix Technology Co., Ltd. > usb 1-1.5: 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/input3 >
Everything looks good here. > > > When i just try to launch the following command, then I get the following > error: > > gst-launch-0.10 v4l2src > > Setting pipeline to PAUSED ... > uvcvideo: Failed to submit URB 0 (-28). > Pipeline is live and does not need PREROLL ... > ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Error > starting . > Additional debug info: > gstv4l2object.c(1886): gst_v4l2_object_start_streaming (): > /GstPipeline:pipelin: > system error: No space left on device This looks like a bandwidth issue, I get a similar error if I try to open two or three devices at the same time and the request bandwidth is too much for the usb pipe to handle. Are you using a usb1 or usb2 port? Most of these ARM boards use have usb1 ports, so you can't use the full camera capabilities (resolution/fps). > ERROR: pipeline doesn't want to preroll. > Setting pipeline to PAUSED ... > Setting pipeline to READY ... > Setting pipeline to NULL ... > Freeing pipeline ... > > The error seems to come from the device/uvcvideo layer since this error > clearly relates to the driver endpoints. > > My final goal is to submit such a command (with the right jpeg/png encoder): > gst-launch-0.10 v4l2src ! pngenc ! filesink location=test.png > > Were there recent fixes to the uvcdriver (which Freescale did not report)? > My driver version is 0.1.0. I read this in the uvc_driver.c file (from > /linux/drivers/media/video/uvc) provided with my evalboard BSP. > > I noticed that what I want to do works fine on Ubuntu 09.04 (the kernel Maybe you are using a usb2 port here ? > features the uvcvideo). If I type modinfo > /lib/modules/2.6.28-11-generic/kernel/drivers/media/video/uvc/uvcvideo.ko I > get the following driver version: > Don't believe the reported uvc version, use the kernel version instead, uvc is built-in the kernel since 2.6.27 > filename: > /lib/modules/2.6.28-11-generic/kernel/drivers/media/video/uvc/uvcvideo.ko > version: v0.1.0 > license: GPL > > Thus I guess that Freescale BSP uses the same driver version as Ubuntu 09.04 > does. > > If required I can send more information to help solve this issue. > > Best Regards, > Franz > > _______________________________________________ > Linux-uvc-devel mailing list > Linux-uvc-devel@lists.berlios.de > https://lists.berlios.de/mailman/listinfo/linux-uvc-devel > > _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
