[mythtv-users] Any hope for 1080i content at 1080i with nVidia?
John.Veness.myth at pelago.org.uk
Tue Jul 31 17:00:50 UTC 2007
Steve Smith wrote:
> (2) If however you are doing some scaling then what you are outputing
> isn't line for line the same as the signal so some form of
> de-interlacing is needed. When does this happen?
> One case is when you output a 16:9 format mpeg on a 4:3 TV. The
> mpeg has 576 (for PAL) lines, but to get the right aspect ratio,
> this is scaled to 0.75*576=432 lines. Now our fields don't match
> up so we need to modify the picture with some form of deinterlacing.
Just out of interest, my old 4:3 Panasonic TV (now since died) had a
mode where it would squash a picture vertically so that you were still
getting 576 lines in a smaller physical space. If MythTV could output
suitable video for that situation, it could theoretically not need to
deinterlace. (I realise this doesn't apply to all 4:3 users).
John Veness, MythTV user
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