[mythtv] Stretching to 16:9 ?

[Joel Melohn]

I don't know if this information will be of any help, but Dscalar when
running on Windows is able to recognize a NTSC feed that has black bars on
top and bottom. It resizes the window to fit the actual picture size.
Dscaler source is available on sourceforge.

Joel

-----Original Message-----
From: mythtv-dev-bounces at mythtv.org
[mailto:mythtv-dev-bounces at mythtv.org]On Behalf Of Kristof Pelckmans
Sent: Monday, September 29, 2003 5:13 AM
To: mythtv-dev at mythtv.org
Subject: [mythtv] Stretching to 16:9 ?


Hello everyone,

I got up to the point where I have MythTV properly configured. The only
annoyance that I still have is the support of Pal plus. This is a 16/9
format squeezed in a 4:3 PAL signal. The signal is encoded so that original
4:3
TVs will display the 16:9 with black bars above and below the screen :

Situation 1 : 16:9 on native 4:3
*********
*-------*
*       *
*-------*
*********

Only true Pal plus decoders will use the information that is hidden in the
black
bars to produce a real 16:9 image when displayed on a 16:9 screen :

Situation 2 : decoded 16:9 pal plus on native 16:9
*************
*           *
*           *
*           *
*************

Of course, regular 4:3 programs will be displayed with black bars on the
left
and right side :

Situation 3 : 4:3 on native 16:9
*************
* |       | *
* |       | *
* |       | *
*************

I force MythTV (including all menus) in 4:3 mode on my 16:9 screen. However,
this gives the following result with Pal plus programs :

Situation 4 : 4:3 (with 16:9 inside) on a native 16:9
*************
* --------- *
* |       | *
* --------- *
*************

Let me explain why :
There is no card that does pal plus decoding, so MythTV always thinks it
sees a
full 4:3 screen, even when there are black bars above and beyond the screen.

The solution ?
First of all, getting the full quality of a 16:9 pal plus image is never
possible, since the TV card is not able to decode the pal plus information.
The
only solution here is stretching the image (without changing the size of the
4:3
recording). There is no way of knowing on forehand which image needs to be
stretched, so the only way of controlling the behaviour is to add this
functionality to a button on the remote control. I guess this could be done
using the XV extensions.

Another issue to look at is whether the frontend buttons cannot be shown on
a
16:9 screen without being stretched to ovals. I guess this has something to
do
with the window layout of QT.

Could somebody point me out where I have to look in the code to make some
adjustments and tell me whether XV would do the job ?

Greetz,

Kristof
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