jit.qt.grab can't open device

Jun 9, 2013 at 5:06am

jit.qt.grab can't open device

In a device I created and that worked yesterday, jit.qt.grab can’t access my mbp cam anymore. I get ‘could not create video channel -9405′ and ‘error opening device for grab’ messages. Grabbing worked with another device, and in max standalone. I restarted with no result.And suddenly as fast as it stopped working, it worked again. What does this error message mean ?

Jun 9, 2013 at 5:09am

Funny, when trying to search google for that message, got this thread : http://cycling74.com/forums/topic/jit-qt-grab-problem/
No one answered at that time so will I be more lucky ?

Jun 9, 2013 at 6:17am

Hello Stephane

Are you using 64 or 32 bit Max? I noticed several problems with [jit.qt.grab] and [jit.grab] – especially related to stability (crashes or strange artefacts in image after on-the-fly resolution change), but never problem, like your. Anyway: I discover, that 64 bit Max is less stable (yet?) when I’ experimenting with grab.

Of course, I can look on your patch too, if you want to post something – maybe problem has different nature.

Jun 9, 2013 at 10:38am

32 bit version. BTW, I think I found the reason but it’s still odd. Jit.qt.grab outputs to a texture and the receiving matrix didn’t receive any bang. So I changed my default metro setting. But should that prevent the cam to open ? I tried to make a patch with just an open message to jit.qt.grab and the cam opened so this makes me think this can’t be linked to the output of the object.

Feb 6, 2014 at 6:53am

I’m still having a problem with this…I’m a bit of a newb but tried in both 64 bit and 32 bit max on a 64 bit machine…please help?

Feb 6, 2014 at 10:45am

have you updated to 6.1.6?
which OS version?

Mar 7, 2014 at 1:55pm

This problem is rearing its ugly head again…

I get the following error when I try to run jit.grab

jit.grab: jit.qt.grab: could not create video channel -9405
jit.grab: jit.qt.grab: error opening device for grab.

I am running on a Macbook Pro OSX 10.8.5, Max 6.1.6 (32-bit)

Any idea what the issue might be?

Mar 25, 2014 at 1:56pm

Is there any word on this issue? I cant use my camera!

Mar 25, 2014 at 3:12pm

if this is a newer laptop, it’s possible that the facetime camera won’t work with the older quicktime drivers.

in this case you need to tell jitter to use the newer drivers.
1. restart Max
2. new patcher
3. new message box with “; jit usealtgrab 1″
4. lock patcher and click message box

make sure you do this *before* you add any jitter objects to your patch.

if you find that your camera works with the new drivers, you can make this the default by typing “; jit usealtgrab 1″ in a file named “jitter-config.txt”, located anywhere in the search path and it will be executed when Jitter loads.


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