[mythtv] 4:3 Zoom code changed?
doug at ties.org
Wed Nov 12 11:09:01 EST 2003
On 2003.11.12 09:49, Edward Wildgoose wrote:
> Basically I have a 4:3 telly, but the BBC insist on broadcasting
> everything in 16:9, but when it actually is a 4:3 broadcast then the
> 16:9 picture has black bars down the left and right (as well as the
> letterbox ones on the top, ie black border all around)
> | ____ |
> | |___| |
> However, when I use the zoom mode then the screen is expanded
> left/right to fit the picture, but the height is expanded by
> significantly more than a proportionate resize and the top/bottom are
> cut off, and people become tall and thin.
> Does that make sense?
Yes, that's what I was intending to accomplish, for both 4:3 and 16:9
sets (though for 16:9 sets, the offending situation is a 16:9 program
broadcast within a 4:3 frame). The old code functioned only for 4:3
I'll take another look at this tonight, but here's my math; let me know
if I've missed something:
Your screen is 16 units wide and 12 high (for an aspect ratio of 4:3).
A widescreen frame inside this screen occupies an area 16 units wide
and 9 units tall. A 4:3 frame inset within this widescreen frame
occupies an area 12 units wide and 9 units tall. So to expand this
frame back to your full screen, we must blow it up by 4/3 and recenter
Oh, one final question... are the pixels in the video nonsquare? Is
this BBC "widescreen" mode really anamorphic? If this is the case, I
think I really do need the pixel and display dimensions of the various
parts in order to make sense of things.
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