#Premiere/VVS Video Rates
19-Dec-94 12:57:17
Sb: #121-#Premiere/VVS Video Rates
Fm: A.J. Lahosky 73353,761
To: Craig Swanson 72714,3267
Ah, this question 🙂
QuickTime data rates (what you see in the Premiere quality settings) don't
reflect raw drive transfer rates (say, using FWB's utilities) much at all.
Those raw rates are for uncompressed data, which the hardware can compress as
it's transferring to yield really impressive numbers. The video stuff coming
out of your VVS card is major compressed, on the other hand. Hence the lower
numbers.
Which brings us to that rather confusing settings dialog. The higher the
transfer rate you set in there, the LESS the VVS (or whatever) card compresses
the video data (= better quality). The lower the rate you set in there, the
MORE the compression card squashes your data (= less quality, more lossy)
before passing it to the bus out to the array. It's a rather unintuitive way
to do such adjustments, IMHO.
Depending on what size video you're capturing (640×480, 320×240, etc.) and what
sampling rate you're doing audio at, you need to tweak this data rate setting
until you get what you want. If you're trying to get a lot of video into 4GB,
you may also need to compress your video more to get it all on.
– A.J.