Tuukka Toivonen wrote:
On Mon, 16 Jun 2003, Gerd Knorr wrote:
in calling IOCTL WITH VIDIOCSYNC- should it take a long time ?
it takes more than half a second, (and the frame number parameter
Sorry, I missed the beginning. What camera, what driver? Any reasonable USB
camera should give at least 7.5 fps, which makes average maximum for
VIDIOCSYNC 0.13 seconds. In general, VIDIOCSYNC should take about 1/f where
f is framerate, or less if you wait a while between successive calls to it.
To be complete: ... if there is video signal. If not, some boards have a
PLL supplying a (usually good) approximation of the frame rate; other
boards start grabing at (AFAIK) random intervals (2 or more times the
normal frame delay).
sync blocks until the hardware is done capturing the frame. half a
Exactly. Now the question is, why it takes so long to capture the frame?
Problem with the driver? Badly supported hardware?
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