Hello,
I've been playing around with Mc Clelland's
ov511-2.2.18-backport-1.33-1 driver and a usb Creative Webcam
III. I believe it takes too long to get one QCIF (176x144)
YUV420 frame (60 to 85 ms). I'm running 2.2.18 on a Pentium 3
550MHz PC:
Module Size Used by
usb-uhci 18752 0 (unused)
ov511 61824 0
usbcore 42760 1 [usb-uhci ov511]
videodev 2656 1 [ov511]
I don't care loosing some frames, but definitely need
to capture each frame faster. This is the measured C source
code:
....
mmap.width = 176;
mmap.height = 144;
/* Chrono started here */
error = ioctl (vid, VIDIOCMCAPTURE, &mmap);
if (error || mmap.width!=176 || mmap.height==144)
printf ("VIDIOCMCAPTURE ERROR:%d, %d, %d\n", error,
mmap.width, map.height);
error = ioctl (vid, VIDIOCSYNC, &mmap.frame);
while (error!=0) {
printf ("VIDIOCSYNC ERROR:%d\n", errno);
error = ioctl (vid, VIDIOCSYNC, &mmap.frame);
}
/* Chrono stopped here */
There're no "printf("VIDIOCSYNC ERROR:%d\n", errno)" on my
stdout, so there are no SYNC errors. Is there any way I could
speed this up? I need to get it done in about 30 to 40ms.
Thanks in advance,
Matias.
--------------
Matias Freytes
Laboratorio de Comunicaciones Digitales
Universidad Nacional de Cordoba
Argentina
