[TriLUG] Debugging webcams

[John Vaughters via TriLUG]

 I recently purchased and fired up a Pine Rock64, and I have run into multiple issues that end up being ARM 64bit issues. The software world has not caught up to the 64bit processing for ARM processors yet. It may be you have to trudge through it with the individual software you are trying to use. See if the software projects you need are up to date on some of these issues. You might need to recompile some of the latest or even beta releases. Seems like VLC may already have resolved these issues for your hardware. Meaning the drivers and everything seem to be fine, so that points to the individual software yo are trying to use.
I would start by looking at those software packages dev sites.
John Vaughters
    On Wednesday, April 3, 2019, 11:48:14 AM EDT, Charles West via TriLUG <trilug at trilug.org> wrote:  
 
 Hello,

I'm having a bit of a strange problem with a USB webcam and I am not really
sure what to try next.  I'm working on a robot to deliver drinks on golf
courses and I'm using OpenCV to get the images from the webcam so that I
can process them.  The particular one I got is a special wide-angle module
with fairly low latency.

Retrieving images and processing works fine on my laptop (running 64 bit
Ubuntu 18.04) and I can access the camera normally with programs such as
GUVC.  However, when I port the camera/code over to the Nvidia Jetson Nano
it suddenly starts having issues.

GUVC crashes when I try to open it.
Cheese doesn't detect the device (despite it showing up as /dev/video0)
Opencv hangs when I try to capture a frame from it
VLC displays video from it flawlessly

Any ideas what to try next?

Thanks,
Charlie West
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