I am using virtualdub, win98se, duron 750, 300MB ram
hide on capture videohighway bt848 capture card.
capturing 640x480 30fps, no audio, no compression
virtualdub test internal capture
i.e (not actually capture into harddisk)

when i capture in yuv2 cpu usage is ~40-45%
when i capture in rgb15 cpu usage is ~25%
the 2 capture has about about the same data rate both
~17MB/s


i thought yuv2 (2 byte/pixel) is the native bt848 format (raw)so CPU usage
is mininal. dont understand why rgb15 use less CPU. since
rgb15 must be converted from yuv2 after bt848 returned the data.