On Fri, Sep 19, 2003 at 09:36:55PM -0700, Steven M. Schultz wrote: > > 640x480? Thought fullframe NTSC was 704x480 - or is the DC10 using > square pixels instead of the Rec.601 10:11 pixels? DV's weird - it > gets an extra 8 pixels on each side for 720x480.
The video digitizer chip that's used on the DC10+ card does square pixel, 640x480 max resolution capture for NTSC input signals. That's as high as it will go. > > results in a sustained average of 7.5MB/s of data being written > > to disk. I only see data rates in the sub 3.5MB/s range for > > 320x480 frames, with a driver quality factor of 50, which gives > > about 2.5MB/s. > > > Ah, that's what I was curious about - thanks for the info! > > I was under the impression that the MJPEG cards had similar data > rates/compression as DV did - and that's only 25Mb/s (~3.5MB/s) for > full quality (no choice in the matter ;)). Nah, the MJPEG cards eat far more bandwidth for the same apparent quality level. From what I've read on the web, DV's encoding algorithm is better tuned/designed to handle the oddnesses of video capture, and so it achieves a lower data rate for the same quality level. ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
