[mythtv-users] NVidia non-interlaced video output quality-loss?
thomas at boerkel.de
Sun Feb 15 06:11:52 EST 2004
steve at nexusuk.org wrote:
>>What are the exact consequences of the non-interlaced video output with
>>the NVidia cards?
> A loss of picture sharpness - basically it's slightly blurry in the
> vertical direction and high motion scenes will look a bit blurry as it
> combines the 2 fields (which will be significantly different from
> eachother in high motion scenes). Its basically the same as turning on
> deinterlacing in Myth.
Don't I have to turn deinterlacing on in Myth, if I have a NVidia card
and my captured MPEG2 is interlaced (from PVR-250)?
> Horizontal resolution should be unaffected.
>>Assuming that analog TV is 352x380 native, would I then only have
>>352x240? Isn't that a big loss in quality?
> Where are you getting 352x380 from? PAL is 768x576 and NTSC is 720x480.
Sorry, typo! I meant 352x480. I thought that analog TV only has half the
possible horizontal resolution.
> Deinterlacing only affects the vertical resolution, and it doesn't just
> throw away one field, it blends them together, so the output won't be
> nearly as bad as just throwing away one field (nor will it be anywhere
> near as good as keeping all the fields and watching an interlaced
OK, thanks. I am curious, how it will look (buying my MythTV box
components next week).
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