[GEM-dev] V4L2

[Claude Heiland-Allen]

Hi,

cyrille henry wrote:
> i compile gem with V4L2 support, but it does not really work.
> i'm really missing a (working) V4L2 support in gem. 

There are so many incompatible formats (RGB, YUV, YV12, JPEG, MJPEG, 
etc, ...) for V4L2, as described here:

-- irc.freenode.net/#dataflow/2008-03-31 --

20:19 < wip> is gem compatible with v4l2?
20:19 < wip> cause my built-in webcam is working with 
gstreamer-properties (v4l2)
20:19 < wip> but i cannot use it with gem...
20:48 < matju> wip: do you know what's the pixel format of your camera? 
cause this could be the problem
20:48 < matju> wip: the V4L2 API cannot be covered by GEM, because it's 
ever expanding, because Alan Cox has ruled that "format converters" are 
forbidden in the Linux source code.
20:49 < matju> wip: and i mean, the V4L2 API cannot be covered by 
anything at all.
20:49 < matju> wip: so you have to be lucky to have a camera that works.
20:50 < wip> matju: ic
20:50 < wip> matju: that's sad
20:51 < wip> matju: i will make some more test
20:52 < matju> wip: well, i spent just enough time on the v4l 
mailing-list to understand that. after that, i didn't want to waste time 
on that mailing-list. it's not for mere mortals, you know.


So what is needed is a userland V4L2-support library that provides all 
the format conversion stuff, as it doesn't make sense for every app to 
implement them natively, but I don't know if that exists...

Maybe VideoJACK would work for something like this?


Claude
-- 
http://claudiusmaximus.goto10.org