[MEncoder-users] yadif: what does "spatial interlacing check" mean?

[Christian Ebert]

* Peter on Tuesday, June 29, 2010 at 01:10:43 -0400
> Christian Ebert wrote:
>> TFM say about the 2 and 3 options for yadif that they "skip
>> spatial interlacing check". What does this mean exactly? What's
>> the better way to go if I want better quality regardless of
>> encoding time? And would recommendations differ if I use yadif in
>> connection with mcdeint?
> 
> I'm sorry you didn't get an answer to this, because I need it too. I
> normally see, when I google for this stuff, that YADIF=3 is chosen.
> I THINK that is because whatever the 'spatial interlacing check'
> that YADIF=1 would do, would create interpolated data that mcdeint
> would then overwrite, wasting effort... but I'm only guessing!
> 
> Would it be correct to say that
> 
> YADIF=3 would give the fastest/worst result
> YADIF=1 would give a slower/better result
> YADIF=3,MCDEINT would give an evenslower/evenbetter result
> 
> and that it would not be sane to use YADIF=1 with MCdeint?

I am now using yadif=1 without knowing what I am doing ;-)

> Is it also true that if you choose a 'bob' type of mode for YADIF,
> that outputs a frame for each field, that 'framestep=2' will get
> things working properly by telling mencoder that the frame rate is
> now double what it thought based on the input fps?

No. framestep=2 will just throw away 1 frame. Of course you get a
way smoother image when you run at e.g. at 50 fps than at 25 fps.

c
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