Hallo > > I would suggest starting here: > > > > http://www.mir.com/DMG/aspect.html > > > > and see what gets answered. (Not everything, but it is a start.) > > Cool. Maybe I should try this from another angle, given that I > capture at 352x480, and say, by experimentation, that I discover that > I need to crop 57 lines from the top and 57 lines from the bottom to > be rid of the black, bit-wasting bars. If you plan HW playback it is not wise to crop the images to a unusal size. You should use there the yuvscaler -I ACTIVE_widthxheight+xoffset+yoffset for setting everything outside the area to real black. You can also use yuvdenoise for that.
Than the mpeg encoder does not spend much bandwith for that ares. > Maintaining field parity is very important, and assuming that when > given the parameter of "-fs" MPlayer _centers_ the image veritcally, I > really should only crop either 56 or 58 lines so that an odd field > starts on a odd line and and even field starts on an even line. Is > this a correct assessment? > > Now given that my frame height is now 368 (480 - 56 - 56) and width is > 704 with a pixel ratio of 10:11, and my formula for arriving at the > display aspect ratio being: > > width * 10 > ---------- : height > 11 > > my display aspect ratio for 704x368 would be (704 * 10 / 11) / 368 > (aka 640:368) which is 1.7391. > > Did I get anything incorrect? Lookes correct. I would suggest that you encode both version one with croping and one with setting the active area. And see afterwards if the difference is with the calculation. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard ------------------------------------------------------- This SF.NET email is sponsored by: SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See! http://www.vasoftware.com _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
