[mythtv] Stretching to 16:9 ?

[Oscar Carlsson]

Hello Kristof,

Have  you  tried  the  strange widescreen mode thingie that's a fix for BBCs DVB
broadcasts?  Check keys.txt, and I guess you need the CVS, think it got in after
0.11.


/Oscar

Monday, September 29, 2003, 12:13:07 PM, you wrote:

KP> Hello everyone,

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

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

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

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

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

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

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

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

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

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

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

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

KP> Greetz,

KP> Kristof
KP> _______________________________________________
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-- 
Best regards,
 Oscar                            mailto:oscar.carlsson at home.se