lincolnhard / v4l2-framebuffer Goto Github PK

hi,
when i use my notebook‘s camera，it is unable to display.
thanks!

Hello,

My camera record with RGB888 but the screen is RGB565, how to convert it?

After I plug in the camera, I compile and run it directly，sudo ./v4l2-framebuffer，

Hi, thanks for the release. I'm currently working on context-aware video encoding which aims at setting different QPs for different area within frame to be encoded according to grayscale saliency map where white areas indicate ROI areas. Now I'm struggling at how to implement context-aware encoding in V4L2. Any advices would be very appritiated.

In routine parse_im (file "video_capture.c") you protect against the calculated values of RGB being greater than 255, and clip them to this maximum value. However you do not protect against them going negative (which can happen in dark areas of the image).

The code needs to be extended as:

        if(B > UCHAR_MAX){
            B = UCHAR_MAX;
        } else if(B < 0){
            B = 0;
        }
        if(G > UCHAR_MAX){
            G = UCHAR_MAX;
        } else if(G < 0){
            G = 0;
        }
        if(R > UCHAR_MAX){
            R = UCHAR_MAX;
        } else if(R < 0){
            R = 0;
        }

How we can use opencv Mat object to write fraemuffer ?