[jitter] Re: multiple Firewire cameras and jit.qt.grab

On Dec 19, 2007, at 9:54 AM, Derrick Giscloux wrote:

>
> Perhaps I should start a new topic, don't know, sorry Dan ...

Yes. You should start a new topic in the future.

> I have a difficulties with an Sony Handycam HDV 1080i
> the "getdevlist" message to [jit.qt.grab] gives me good options :
>
> "DVCPRO HD (1080i50)", "DVCPRO HD (1080i60)", "DVCPRO HD (720p60)",  
> "DV Video", "IIDC FireWire Video", "USB Video Class Video"
>
> but impossible to "open" [jit.qt.grab] :

HDV is *not* DVCPro HD. Unless it changed in recent QT releases, no  
HDV input is supported in Quicktime at least on Tiger (iMovie and  
FinalCut use a private, not QuickTime framework for grabbing HDV  
streams). I've heard some reports from users about there being HDV  
quicktime components in Leopard, but that they don't show up or work  
in Jitter. Nothing on our side will happen for this in Jitter 1.6.x,  
but we can look into it for Jitter 1.7 (Max 5 compatibility release)  
if it is exposed to non Apple applications. I haven't had time to  
research this as core Max 5 work is the current priority.

In the meantime, if you have an HDV camera, and your camera has HDMI  
or component HD output, your best bet is to use a blackmagic  
intensity pro card. They are cheap and offer better than HDV quality  
(avoids the low chroma sampling and high spatial and temporal  
compression of HDV as long as the camera sends the datastream prior  
it's internal application of chroma down sampling and compression).  
The only downside is that you need a desktop with PCI slots. If you  
only need HDMI, I believe the original (no "pro") version might be  
cheaper.

http://www.blackmagic-design.com/

-Joshua