video card at 1080i or 1080p best?

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rlevis

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#102441 15-May-2012 23:49

Using MediaPortal with LG 55" LCD TV. Wondering if I can take the load off the computer/GPU for deinterlacing and let the TV do it without reducing quality.

I'm guessing modern TV's would do pretty good deinterlacing, wouldn't they?

kiwijunglist

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#625849 16-May-2012 02:51

It depends on the TV + PC (Video card's ability + settings) but generally PC will use/can use more complex (better) deinterlacing methods.

HTPC / Home automation (home assistant) enthusiast.

rlevis

347 posts

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#625851 16-May-2012 03:48

The PC has an HD4250 ATI integrated GPU which doesn't appear to do better than adaptive deinterlacing. If I set manually to motion adaptive or vector adaptive, it switches down to Adaptive or Bob automatically sometimes.

Is a TV likely to do only Bob or Weave?

sbiddle

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#625855 16-May-2012 06:18

How are you hooking your PC to up the TV?

kiwijunglist

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#625866 16-May-2012 07:45

Video card probably better, also if you set output as 1080i from the htpc, then things that arn't 1080i will look crappier.

HTPC / Home automation (home assistant) enthusiast.

rlevis

347 posts

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#626158 16-May-2012 14:12

sbiddle: How are you hooking your PC to up the TV?

HDMI cable

stevenz

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#626168 16-May-2012 14:18

Unless your videocard is >5 years old, then 1080p/1080i should make very little difference to it.

You're better off using 720p than 1080i, less chance of horizontal shuddering. Interlacing is bad, regardless of what's processing it.

Regardless, I'd want to do it at the computer and and pass a clean progressive signal down the HDMI.

@KnightNZ

rlevis

347 posts

Ultimate Geek

#626177 16-May-2012 14:39

I used 1080i last night for viewing and couldn't notice any artefacts during moving scenes. The TV does have a freeview tuner in it and all channels are interlaced, so you would think it would have a reasonable deinterlacing chip onboard. But as mentioned, 1080p or other progressive videos will not look so good, so will witch back to 1080p output.

Cheers.

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richms

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#626304 16-May-2012 16:58

1080i content on the PC still gets processed before being reinterlaced by the card, and 2 deinterlacing stages gives double the oppertunity for things to be guessed wrong by one of them.

You only have too look at watching a SD channel on mysky when its outputing 1080i to see things going wrong with double deinterlacing.

Richard rich.ms