"Mike" writes:

> A simple grabber C program, using mmap() on a file descriptor, fd =
> open ("/dev/video0"...) works AFTER
> running tvtime (once after boot-up), but not before. Before tvtime, the
> picture is garbled.
> How do I find out what tvtime does to make it work? What is tvtime
> changing?

Grabber/tuner settings.

http://linux.bytesex.org/v4l2/

--
vale

In article <1166251271.068532.202180@n67g2000cwd.googlegroups. com>,
Mike wrote:

>How do I find out what tvtime does to make it work?

Well, you could read the source.

>What is tvtime changing?

Tuner type, channel? Etc.

Browsing the mailing list archive might give some answers:

http://www.spinics.net/vfl/