> > The problem is, my DVD player cuts off 10 or so pixels from > each side, and 15 or so from the top and bottom. When I try > to play the VCD it renders some of the subtitles off the > screen -- not to mention some of the video.
Are you certain it's the DVD player? It sounds like you are witnessing a designed in parameter of NTSC television sets called "overscan". They display the center of the image, with a portion of the transmitted image off the viewable edges of the screen itself. It sounds like you are witnessing overscan, although maybe a larger amount of overscan than is typical for most TV's. > I imagine everyone's NTSC equipment does this to a certain > extent, but the subtitles are the real problem. > > The actual question: > Is there some trick I can use to fool my DVD player into > clipping less of my video; while still preserving the > desired aspect ratio? > > I was shooting for thin black bars the whole way around, but > it turns out yuvscaler won't do that. Where/what is introducing the subtitles into the video? Are you using some tool to "write" the subtitles on each video frame before it gets coded by the mpeg encoder? Or are the subtitles generated by the DVD player from the DVD standard subtitle stream that can be included in a DVD coded mpeg/vob file? Because if it's the second, the garden standard subtitle stream of the DVD standard, there's nothing you can do to the video ahead of time to prevent clipping the subtitles if they are clipped on your TV. The subtitles are not present on the images in the mpeg file, it's your DVD player chipset that overlays the subtitles at mpeg decode/ntsc signal generation time, and either your DVD player is out of spec (possible) or your TV set is overscanning excessively (more likely). In this case, no matter what you do in scaling the video up/down, the subtitles are always going to appear in the same place on the video output from the DVD player. That said, you can use y4mscaler (search the list archives for the url) to take your source image and matte it into a destination image with black (or the color of your choice) borders all around. And it will maintain aspect ratios unless you go out of your way to override it's selections for scaling. Also, if you are playing VCD's on a DVD player, you might be noticing what I notice on my Hollywood+ DVD card with half size DVD images (352x480). The H+'s subtitle overlay hardware (at least that part which mplayer turns on) seems to always think it's working with a full frame DVD image (704/720x480) and when playing a 352x480 file (a legal DVD frame resolution) the subtitle overlay is twice as wide as the viewable image, trimming off half of the info mplayer wants to display. It's not a big deal to me because the only info trimmed is the upper edge of "adjust bars" [think brightness/contrast/etc.] but it is an effect I've noticed. Your DVD player may just be doing the same. ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
