[GEM-dev] V4L2

[cyrille henry]

ok, i think i understand the problem.


i can have an image with mplayer
( mplayer -tv  driver=v4l2:device=/dev/video0:input=1:width=640:height=480 tv:// )

gstreamer is also able to use this device (but only input 0, as i don't know how to change input)

do you think there is a hack to forward this images to Gem?

thanks

cyrille

Claude Heiland-Allen a écrit :
> 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