Question: deringing within MPEG2Source

[Chainmax]

I want to use deringing on the MPEG2Source line in one of my DVDs. Is it ok to just put MPEG2Source("X:\wherever\blahblah.d2v",cpu2="ooooxx") or should I add ipp=true?

[Cyberia]

Well, you are really asking two different questions there.

cpu2="ooooxx"

specifies de-ringing only. While:

ipp=true

specifies whether or not to force interlaced or progressive post-processing. If you do not specify the ipp parameter, DGDecode will follow the PROGRESIVE_FRAME flag on a per-frame basis. That is, the post-processing mode is re-evaluated for every frame.

cpu2 and ipp are completely independant, so you can use one, the other or any combination.

[Chainmax]

I know that the cpu2 line I posted means deringing only, but what I'm asking is that since I'm going to dering an interlaced stream (using that cpu2 call in the MPEG2Source line), shouldn't I set ipp=true? I thought that one had to set ipp=true for interlaced streams.

[Video Dude]

Yes, set ipp=true when you have interlaced video.

[Cyberia]

I'll repeat:

ipp specifies whether or not to force interlaced or progressive post-processing. If you do not specify the ipp parameter, DGDecode will follow the PROGRESIVE_FRAME flag on a per-frame basis. That is, the post-processing mode (ipp) is re-evaluated for every frame.

You do not have to specify ipp=true for interlaced video.

I would probably not specify the parameter and let DGDecode decide. If that doesn't work to your satisfaction, you can force one mode or another.

[Chainmax]

Ok, I understand now. Sorry for the pig-headedness :).

What would be the advantage of using this switch instead of letting DGDecode evaluate each frame, depending on the source? Maybe a speed increase?

[Cyberia]

Well you'd want to use the ipp switch if the PROGRESSIVE_FRAME flag appears to be unreliable (ie: bad encode/mastering errors)