On Mon, 19 Nov 2007, Roger Heflin wrote: >> Roger Heflin wrote: >>> Also note that if you put a widescreen without letterbox the video >>> shows at the top of the screen the the zoom function works badly. >> >> Nope, I fixed that almost 2 years ago (the commit was made by jon on 18th >> of December 2005 by the looks of it). It should only go into this mode if >> you've told mvpmc that you have a 4:3 display anyway. >> > > I am not talking about zoom on the mvpmc I believe > me and the other person were both talking about zoom on the widescreen TV > itself to make a 4:3 letterbox display go full screen through the use of the > zoom function in most of of the newer TV's in the US. If the > widescreen display is at the top of the screen it does not work well. > > And if you fixed that, it does not appear to actually work under a number of > conditions. If I display a widescreen signal without doing > a crop and expand to center it (with mencoder), it displays at the top of the > screen and the TV's soom function works badly with an uncentered signal, if > you believe it works, I should be able to isolate a small test case that > fails on mine. Current I take a HDTV 16:9 convert it, > crop it to just the signal and then center it back to in the center > of the 4:3 display (resulting in 4:3 letterbox) and then use the TV's > zoom function to make this appear to be full screen widescreen.
Ahhh...Right...now I see what you're talking about. The problem you're seeing here has nothing to do with the MVP's support for widescreen TV. The hardware MPEG decoder in the MVP only supports MPEGs with a standard number of lines, 480 for NTSC and 576 for PAL (and maybe exactly half these numbers too for VCD support, not sure about this). If you give it an MPEG with less lines then it will simply draw it at the top of the screen. As I explained in my email the only difference between a 16:9 MPEG and a 4:3 MPEG is a flag in the headers, both MPEGs are 720x576 (or 720x480 for NTSC). The digital video pixels when they're drawn on screen are not necessarily square (I don't think they ever are for DVD/DVB/ATSC MPEGs) and they're a different shape for 16:9 and 4:3 MPEGs. All you should need to do to create an MVP compatible MPEG is scale to 720x576 (or 720x480 if you're stuck with rubbishy NTSC), and make sure that the MPEG headers reflect whether it is 16:9 or 4:3. Then if you have "-a 4:3" the MVP will automatically letterbox any 16:9 programs, and if you have "-a 16:9" it should send appropriate WSS to your TV to indicate that the signal is 16:9/4:3. You shouldn't need to crop anything (unless the MPEG your broadcasters transmit already has a letterbox drawn on it), and definitely shouldn't need to draw a letterbox. All you should need to do (for NTSC) is: mencoder -vf scale=720:480 or mencoder -vf scale=640:480 or mencoder -vf scale=704:480 or one of the other standard resolutions which the MVP hardware supports. I think mencoder should translate the aspect ratio into the correct MPEG header here without any problems, but you may be able to force it with -aspect 16:9 or -aspect 4:3 If you really want a bit more of a brain hurt then you'll find a quick dig around google shows http://lipas.uwasa.fi/~f76998/video/conversion/ which seems to do a good job of trying to explain all this malarchy. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Mvpmc-users mailing list Mvpmc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mvpmc-users mvpmc wiki: http://mvpmc.wikispaces.com/
