On Tue, Apr 13, 2010 at 11:01 AM, Andreas Auer <[email protected]> wrote: > Markus Rechberger schrieb: >> >> On Tue, Apr 13, 2010 at 10:27 AM, Andreas Auer <[email protected]> >> wrote: >>> >>> Hi, >>> >>> I'm trying to get a UVC webcam working with the latest khilman kernel >>> (2.6.34) on a Davinci EVM like board with DM6446 processor. >>> >>> I'm able to request the buffers and queue them without errors. But if I >>> switch on the streaming the UVC driver tells me: >>> "uvcvideo: USB isochronous frame lost (-18)." >>> >>> Some time ago, I tried the 2.6.32 kernel from the arago project and >>> webcam >>> capturing was working out of the box but WLAN was not working. (so, I >>> switched to the khilman kernel). >>> >>> Maybe, someone can help me with the uvc webcam problem!!! >>> >> >> with our tests the DM6446 only supported up to around 4.5 mbyte of >> isochronous data... >> Raw Analog TV 720x576x25 requires around 170 mbit, I guess webcams are >> near to that level there's no chance to get such a thing work. >> Maybe MJPEG or MPEG based devices can work with it. > > Thanks for your reply. I have a Logitech QuickCam Communicate Deluxe with > MJPEG format. And this webcam is working with the 2.6.32 kernel from the > arago project. So, I think this cam should be working. > > Does anyone know what's the above "status code" -18 means?? >
that something with the usb controller/driver (not the cam driver) is broken. On the other side you also need to find an accelerated solution to decode MJPEG ... (the ARM part of the dm6446 will not help you in that case). You might better look for an MPEG capable USB camera (although I don't know which of them are supported with Linux) Markus _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
