[vdr] vdr and YUV output

Andreas Holzhammer - Privat andreas.holzhammer at gmx.de
Tue Jun 7 12:10:59 CEST 2005


Nicolas Huillard schrieb:
> Andreas Holzhammer - Privat a écrit :
> 
>> I'm in the course of converting my home cinema equipment from S-Video 
>> (Y/C) to YUV connection.
>>
>> Currently I use vdr with a full-featured card and s-video output 
>> through the j2 connector. What is the "recommended" way to move vdr to 
>> YUV output, as the FF cards are not capable of doing so? I don't want 
>> to shell out to much money, so RGB->YUV converters are probably out of 
>> the range.
>>
>> Would a cheap (PCI) ATI (Radeon 8500/9x00) card with an YUV adapter be 
>> suitable, and what picture quality is achievable through this setup? 
>> Are there any other options? The PC is a 1.3GHz celeron MediaPortal, 
>> so I can't spare to many CPU cycles on either X or software mpeg 
>> decoding.
> 
> 
> Your Celeron have enough power for softdevice (if you don't plan on HDTV 
> before softdevice make use of hardware accelerated decoding).
> Well supported card are Matrox, with DirectFB. Maybe they are capable of 
> YUV output.
> If you plan to convert your equipment, why don't you go the RGB way ? Do 
> you already have a special output device with YUV input ?
> In fact, a VGA card with an overlay is actually an YUV to RGB converter, 
> and a typical display device is in fact RGB by design (CRT, LCD, DLT, 
> Plasma). So why convert from YUV (MPEG2 stream) to RGB, then output in 
> YUV and convert back to RGB inside the display device ?

Nicolas,

thanks for your recommendations, I will have a look into the Matrox 
route as well. I'm somewhat concerned on CPU power especially when 
playing back mpeg4, but I could offload this to a pinnacle showcenter 
type box.

There are three reasons to use YUV:
- progressive scan is possible through YUV
- DVD media is natively YUV
- most important, my amp (Yamaha AX1) is capable of switching YUV input 
signals (and add his OSD to it), but can't do RGB

So the highest achievable quality for me is YUV



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