DV cam resolution problem!
Posted on 2003-11-19
I have this assignment to make a program that displays a video stream from a DV camera (using firewire). I found a great sample in the DX SDK called StillCap and used the same functions for initialization of the camera. Everything seems ok at first; a 720x576 video window is displayed and still capture works too. The problem comes up when I run my application on a laptop. Now the resolution is 360x288, thus half of the DV PAL standard size. My first guess was that the hardware (P2-400 MHz and 8MB video memory) was too old to handle such high resolution video streams, but I'm not sure that is the problem here. I've tested it on a 1GHz-laptop too, with the same result. Shouldn't 1GHz be enough?
My question is; WHAT causes DirectShow to SHRINK the video resolution?
Please note that it is impossible to change the resolution on this DV camera (Microsoft's reference program (amcap.exe) cannot change the resolution either). I have also tried to stretch the video window, but that is an unacceptable solution since I really need a real 720x576 bitmap for this assignment.