Has anybody managed to capture video from a usb webcam on a BBB with any
recent Linux distribution using OpenCV cv::VideoCapture functions?
I'm using a Logitech C615 which works perfectly with OpenCV on x86 PCs and
on a Raspberry Pi 2 (a little slow but it works) running the latest
Raspbian Jessie image.
But I haven't yet managed to get anything but completely black images
running the same program on my BBB. I've tried it with a recent Arch Linux
image. I've tried Ubuntu 14.04, Debian 7.9 and 8.3 (with a few different
kernels) from BeagleBoard. Nothing! No problems doing anything else in
OpenCV -- it can load and display individual images and videos from files,
just not from the camera. And in all of these installations I can capture
video from the camera with other programs (using v4l2) -- just not with
OpenCV.
I've seen Derek Molloy's videos demonstrating use of OpenCV on a BBB -- but
he was running it under Angstrom, and as far as I can see the last Angstrom
distro was at least 3 years ago.
Any suggestions for something more recent?
By the way, here's a sample of a program that's fails to capture any video
on the BBB (it displays the frame size and then just gives a series of
"select timeout" messages):
#include <iostream>
> #include <opencv2/highgui/highgui.hpp>
>
> int main(int argc, char *argv[]) {
> cv::VideoCapture cap;
>
> cap.open(0);
>
> if(!cap.isOpened()) {
> std::cout << "Did not connect to camera." << std::endl;;
> return -1;
> }
>
> double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH);
> double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT);
>
> std::cout << "Frame size: " << dWidth << " x " << dHeight << std::endl;
> cv::namedWindow("MyVideo",CV_WINDOW_AUTOSIZE);
>
> while(1) {
> cv::Mat frame;
> bool bSuccess = cap.read(frame);
> if(!bSuccess) {
> std::cout << "failed to read frame" << std::endl;
> break;
> }
> cv::imshow("MyVideo", frame);
> if(cv::waitKey(30) >= 0) break;
> }
>
> return 0;
> }
>
Can't get much simpler than that.
--
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