Re: reading a capture from v4l1

[Jeffrey Dever]

I don't understand the point of the VIDIOCCAPTURE ioctl. I expected that I would have to call it before doing a read(). But there is no need, after VIDIOCSWIN the read works anyway.

According to the v4lapi:

Merely setting the window does not enable capturing. Overlay
capturing is activatied by passing the VIDIOCCAPTURE ioctl a
value of 1, and disabled by passing it a value of 0.

So what is the function of this ioctl?



Gerd Knorr wrote:

Jeffrey Dever <[EMAIL PROTECTED]> writes:

I'm perplexed as to how to read captures from the video device. I can
do quite a bit to control my webcam (probe, set window ...) but there
seems to be several modes of reading captures. I'm just trying to do
a simple capture, so I don't want to use mmap at this point as I want
to keep it as simple as possible.

If you are using bttv, make sure you have the 0.9.x version. In 0.7.x
capture via read() simply doesn't work.

Gerd

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