Hi Chris: I can help you to make some test, what librarie version are you using?, distro, etc.. send me also the compilation command that you are using...
Mauricio Henriquez Christopher Harvey wrote: > Hello, > I sent this to the video 4 linux mailing list earlier, but perhaps it's > more appropriate here since the code is very uvc specific. > I've created a small c program that uses pure v4l2 code to read from a > webcam on a uvc driver then copy that data into an SDL overlay. I've > posted the code here: > http://basementcode.com/serverMain.html > and I've attached a log file I created from the output of that program. > Overall the program works great except that after a few frames, about 35 > (varies each run) in my case, the select() function that is supposed to > block until new data from the webcam is available stops working and > returns right away. This isn't a huge problem because the following > ioctl(fd, VIDIOC_DQBUF, &buf) > call simply fails and sets errno to EAGAIN, then my app simply tries > again and again until it works. I'd rather select worked for the entire > duration of the capture to save cpu time and make sure that I read the > frame asap each time. The relevant function in the code I posted above > is "mainLoop", however I can't be sure the error is actually in that > function. I hope I've posted enough information. > Thanks in advance, > Chris. > > > ------------------------------------------------------------------------ > > _______________________________________________ > Linux-uvc-devel mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/linux-uvc-devel _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
