[vdr] Re: Feature request - 16/9 auto-swithing

["Michael Kunzmann" <michael@michael-kunzmann.net>]

> -----Original Message-----
> From: vdr-bounce@linuxtv.org [mailto:vdr-bounce@linuxtv.org] 
> On Behalf Of karim
> Sent: Saturday, January 03, 2004 4:39 PM
> To: vdr@linuxtv.org
> Subject: [vdr] Re: Feature request - 16/9 auto-swithing
> 
> Be carefull !!!
> 
> AFAIK, there is *no* possibility to detect "normal" or 
> "large" signal from a simple composite connection (ie cinch).

There is a possibility to signal the tv that the image is anamorphic. It is
somehow signaled in line 23 (don't know the line number for sure) of the
image. This is called WSS WideScreenSignalling. This works even when using
composite (Cinch) or a S-Video connection. 

The other possibility is pin 8 of the scart connector if it's on 12 Volts
ist a 4:3 image, if it's on 6 Volts it's a 16:9 image.

> 
> It means that your tv detects a letter box programs from the 
> black zones above and underneath the image, and then activate 
> an artificial zoom mode.
> Please note that it's    completely different than the true 16/9 mode,
> because zooming decreases the quality of video : you stretch 
> horizontally and vertically a small image to fill entire 
> screen, without any more information ! (Remember that the two 
>  blacks zones doesn't contain any information and are totally lost).
> => At the end, you are displaying a full screen with no more 
> than about 300 lines...

This is totally different, but my tv does this, too.

> 
> Keep in mind that true 16/9 gives an *anamorphic* image which 
> is only horizontally stretched (by the true anamorphic 16/9 
> mode of the tv). In this way, the maximum resolution is 
> keeping, ie from about 500 lines. Really more efficient than 
> a poor zoom !
> 
> PS : At this time, there is a true 16/9 anamorphic film on 
> ZDF (Astra).
> 
> Bye !
> Karim.
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> 
> -----Message d'origine-----
> De : vdr-bounce@linuxtv.org [mailto:vdr-bounce@linuxtv.org]De 
> la part de Mario Dilleni Envoye : samedi 3 janvier 2004 15:57 
> A : vdr@linuxtv.org Objet : [vdr] Re: Feature request - 16/9 
> auto-swithing
> 
> 
> At 14:38 03.01.2004, you wrote:
> 
> I'm not Klaus;-),
> but can tell you that autoswitching works for me. 
> Unfortunately I'm not sure why, as I've connected my VDR-Box 
> via am AV-Receiver which only has Cinch connectors. But it 
> definetly works ( sometimes it takes a bit to switch back 
> from 16:9 to 4:3).
> 
> I guess it's afeature of my Philips TV-set
> 
> >Hi Klaus,
> >
> >My vdr box is connected to a 16/9 TV. Unfortunately, here in 
> France, we
> have
> >*only* two trues 16/9 channels. It means that every time I 
> zap from a 
> >"normal" to a "wide" channel, I've as well switch manually 
> the tv from
> "4/3"
> >to "16/9".
> >
> >I would like to automate this feature. AFAIK, the only way 
> to drive tv 
> >mode switching, is to connect it through a SCART connector 
> instead of 
> >"cinch" or "mini-din". In this way, in case of 16/9 program, 
> the source 
> >transmit a special signal (*) to switch between "normal" and 
> 'wide' modes.
> >
> >(*) by changing the "commutation lente" pin level from 6V to 12v.
> >
> >I plan to build a home made SCART connector to add the feature. The 
> >commutation signal could be fetched from a serial or parallel port,
> buffered
> >and voltage ajusted, before  driving the SCART through 
> "commutation lente"
> >pin.
> >
> >In VDR version 1.3x, could it be possible that VDR "trig" a 
> serial (or
> >parallel) port pin  in case of 16/9 programs ?
> >
> >If there is another possibility, fell free to tell us ;-)
> >
> >
> >Regards.
> >Karim.
> >
> >
> >
> >
> >
> >
> >
> >--
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> 
> 
> 
> 
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