Ah sorry for the confusion. The USB camera was not working on the old kernel of ARM board. After patching the kernel, I can grab images but the framerate is 1/2.5 of expected framerate. The camera works without any issue on my PC (with kernel 3.13) though. On Wed, Sep 10, 2014 at 6:11 PM, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote: > Hi Isaac, > > On Saturday 06 September 2014 12:35:25 Isaac Nickaein wrote: >> Hi, >> >> After patching the kernel, the rate that images are captured from the >> camera reduce by a factor of 2.5. > > How have you patched the kernel ? If you have both a working and non-working > version you could use git-bisect to find the commit that causes this breakage. > >> Here are a list of frame rates I have tried followed by the resulted frame- >> rate: >> >> 10 fps --> 4 fps >> 15 fps --> 6 fps >> 25 fps --> 10 fps >> 30 fps --> 12 fps >> >> Note that all of the rates are consistently divided by 2.5. This seems >> to be a clocking issue to me. Is there any multipliers in V4L2 (or >> UVC?) code in framerate calculation which depends on the hardware and >> be cause of this? > > -- > Regards, > > Laurent Pinchart > -- 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
