[mythtvnz] Hardware Recommendations

[Brett Miller]

HDMI can not achieve the performance limit of DVI; you rate it to highly.
The cable & connector is cheap.
HDMI has failed to find favour in the audiophile camp due to timing 
jitter issues.
HDMI exists for DRM & to insure the removal computer equipment 
connectors from AV equipment.
Equipment fitted with DVI-I was allowed to output upscaled 720, 1080 & 
1152 analogue signals.

A video card with only HDMI connectors might be required to ONLY work 
with full DRM !

Analogue signals usually look best on an analogue display.
Digital link bypasses a RAMDAC on the videocard & bypasses the ADC DFP 
frontend.
This can only be better unless something is badly configured.
Also should make for a cheaper video card & cheaper DFP.

A high speed (200MHz) analogue signal requires controlled impedance 
cabling system.
Ghosting could be reflections from mismatch etc .

Most (all) DFP have a frontend pre-scaler. Only laptop & iMac (internal) 
screens lack the pre-scaler, in this case the GPU does a virtual 
pre-scale & always drives panel at native resolution.
The pre-scaler implementation has a huge impact on image quality.
I would say it is a must to only drive DFPs  at native resolution & via 
digital link if possible.
Cheap DFPs must have cheap pre-scalers; they should not be able to 
better the videocard GPU.

BUT my Philips Matchline CRT upscaler is much better than the PC video 
card upscaling DVD playback !
This is probably my poor mplayer configuration.


On 26/03/2010 4:49 p.m., Nick Rout wrote:
> On Fri, Mar 26, 2010 at 3:13 PM, Steve Hodge<stevehodge at gmail.com>  wrote:
>    
>> On Fri, Mar 26, 2010 at 1:57 PM, David Zanetti<dave2 at wetstring.net>  wrote:
>>      
>>> SD Component is nowhere near as good as VGA in effective resolution.
>>>
>>> So I'd put them:
>>>
>>> Composite
>>> S-Video, SD Component
>>> VGA, HD Component
>>> DVI, HDMI<= 1.3
>>> HDMI>= 1.4, DisplayPort
>>>        
>> Yes. The only thing I'd add is that the difference between VGA and DVI may
>> be small or large depending on the display device. On my 19" LCD monitors I
>> can't see any difference between the VGA and DVI inputs. On my old 42"
>> plasma the difference is marked - VGA is less sharp and text often has
>> annoying ghosting. The moral of the story is that it's always best to try
>> the various options and see which works acceptably for you.
>>      
> Often the TV will apply different processing to different inputs. VGA
> is seen as a computer input that does not need much processing,
> whereas HDMI/DVI is seen as a TV style input which will be
> overscanned, possibly interlaced, possibly in need of mpeg2 correction
> etc etc.
>
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