Re: Error reading USB camera in BeagleBone with ARM Debian

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Joel,

On Wed, Oct 24, 2018 at 05:31:25PM +0200, Joel Pepper wrote:
> Hi Joseph, Hi Bin,
> 
> I am currently investigating a bug with the BeagleBoneBlack (which also
> uses the AM335x) and a Logitech Webcam, which might be connected.
> 
> I am using a Logitech C270 and if I set the format to YUYV and the
> framesize to 544x288 or larger (including specifically 640x480), any
> ioctl VIDIOC_DQBUF will hang indefinetely. This might be the underlying
> source of the timeout Joseph encountered.
> 
> Joseph,
> 
> have you tried setting the camera to the lowest resolution it can go? If
> low resolutions work, but higher ones, like 640x480 don't, we might be
> chasing the same problem. If not, I will look into my problem separately
> and open a new thread.
> 
> 
> Bin,
> 
> my case happened using ISOC transfers, but my preliminary investigation
> has shown lots of ISOC traffic flowing, apparently successfuly from the
> camera to the BBB, which makes me suspect a problem closer to the
> v4l2/musb boundary, but I'm still reading into the code. If you would
> like to investigate that further, the C270 is rather affordable, but I
> will gladly provide any details, usbmon captures etc. that you require.

I am aware of an issue for 640x480@30fps with some cameras. I am in
full-day meetings this week. Once I get time, I will provide more
details for the issue I know of to see if you have face the same.

Regards,
-Bin.



[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux