Simon Hyde wrote:
> On Fri, 9 Nov 2007, MVallevand wrote:
>
>
> The MVP can output "true widescreen"
> ====================================
>
> The MVP can and does output widescreen signals (they're electronically
> identicle to 4:3 signals). There is no difference between a 4:3 PAL/NTSC
> signal and a 16:9 signal. The analogue signal describing a line lasts 52
> microseconds for both. Even in an MPEG the actual picture is the same size
> (720x576 for PAL or 720x480 for NTSC) for both, there's just a flag in the
> headers specifying whether those 720 pixels show the length of a 4:3 line
> or a 16:9 line.
>
> The real problem you have here is that your cable provider isn't
> broadcasting "true widescreen" pictures in an analogue form, because they
> don't want to upset their 4:3 viewers. Instead they're taking the 16:9
> picture and letterboxing it into the middle of a 4:3 picture. Sadly we're
> not aware of any way to cut out and zoom this section of the picture using
> the MVP's hardware, this would be the cleanest way to handle your
> question.
Most of the TV's will properly "zoom" on this sort of signal so long
as the widescreen is centered both up/down and right/left in the center
of the screen.
>
> What does the "-a" flag do?
> ===========================
>
> The -a flag affects what shape MVPMC thinks your TV is. In reality at the
> moment this only affects what the MVP/MVPMC does with an MPEG which has a
> 16:9 flag in it's header (*):
>
> 16x9: The video is shown as-is, occupying all the picture area of the
> output signal.
> 4x3: The video is letterboxed in the middle of the picture, with large
> black bars top and bottom.
> 4x3cco: The middle bit of the video is chopped out and drawn occupying the
> full area of the output.
>
> 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.
Roger
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