On Tue, 24 Aug 2004, Steven M. Schultz wrote: > > On Tue, 24 Aug 2004, Selva Nair wrote: > > > I know, but I avoid capture cards that generate "square pixels" from > > non-square pixel sources. As you know PAL or for that matter NTSC frames > > It's not generating square from non-square. It's sampling the > analog waveform at a frequency which gives 768 square pixels per line. > > A card is free to sample the analog at any frequency it wants. The > DC10+ just happens to be sampling at the rate which gives 768 active > samples per line. > > > are not exactly 4:3. I hope the card is padding the frame correctly before > > scaling. > > If it's sampling at 14.75MHz then no padding is required - the card > is delivering a 4/3 aspect picture at 768 pixels per line.
Agreed, if its sampling at 14.75Mhz no scaling is needed, only a 1 pixel padding. > > Even though I switched to the DV capture method quite some time ago > I still use y4mscaler a lot when converting HDTV to widescreen DVD > (the scaling's actually more cpu intense than the mpeg2 encoding as > it turns out) and thus need to convert from square pixels to 40:33 > for 16/9 DVD. Oh, HDTV.. well, so its getting harder and harder to avoid scaling, eh? Thanks for the info. Selva ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
