[PD] PDP or GEM linux DV CAM

[cgc]

On Jan 30, 2004, at 5:08 PM, Yves Degoyon wrote:
>
> c/ do a quicktime based capture object for OSX
> ( we will borrow some code from Gem, thanx ).

I would strongly advise you to read the QT docs on Sequence Grabbers 
and components, as well as general QT conventions.  Although the code 
is quite simple and QT takes all of the low level headaches out of 
video capture, there are still many issues that you will run into.  One 
is pixel format - QT supports most of the common FOUR CC ones, but you 
might not be using one of them in pdp, and need to roll your own code.  
Another is the various flags passed to SG calls that can drastically 
affect both performance and quality of the video.  One hint about the 
flags: they don't always do what they say especially when the 
descriptor is something like 'high quality'.  Also, QT is designed to 
run inside of a classic Mac type app with an specific event loop 
structure, and not a Unix process like Pd.  This has brought me an 
nearly unlimited amount of joy in the past while banging my head 
against the QT API wall.

cgc