[MEncoder-users] Trying to fully understand de-interlacing.

[Peter]

Andrew Berg wrote:

> You will waste many bits if you go from 60 fields per second to 60
> frames per second before encoding. You would be compressing generated
> bits, since it's essentially upscaling.

It may sound weird, but in my heart I feel it should be 'better' because the 
upscaling is the inverse of the interlacing "compression" (sorry Grozdan, I 
don't mean it literally) which is like a CBR compression... the same everywhere 
in the frame. Compare with REAL compression, which saves bits by different 
amounts in different parts of the frame (like VBR adjusts over time) and so can 
be more efficient by using the bits in the places where it's needed, and saving 
them where there's nothing much happening.

Upscaling and then compressing afterward is indeed my objective.

> yadif is a very good (but slow)
> deinterlacer and you will get good results with it going from 60 fields
> to 30 frames per second.

I find that hard to believe; if it were true, there would be no point in 
Interlacing. (And films would look nice instead of crap at 24fps.)

> If you want really want to avoid going to 30
> frames per second, you're better off compressing interlaced and using
> yadif during playback. x264 is not optimized for handling interlaced
> content, but it's still more efficient than doing 60p.

Well, my source is already compressed interlaced... perhaps I should just learn 
to live with that.

Thanks, guys.

-- 
Peter

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