IVTC done. Now what??

[pijetro]

Up until now, I've only ever encoded pure interlaced source. I've finally ran into some telecined material, so I wanna IVTC, and see what the advantage is for Television ouptut...

Okay, so I've got a broadcast that was telecined. I decided to do a decomb on it. Since it's for my Television set anyways, what advantage do I receive, and what Video settings in CCEv2.5 do i need checked before output to .M2V??

Up until now, I've only checked the add end sequence, and left everything else unchecked.

Script:

AviSource("f:\capture.avi")
trim(0,25000)
telecide()
decimate(cycle=5)
crop(0,48,0,-48)
addborders(0,48,0,48)

Besides 20% less frames to encode, what’s the other advantages to this setup, over leaving it alone and just running a basic script???

Thanx….

[FOO]

Saving 20% is about all it's good for.
There is a cost in pain and suffering.
Some videos are incorrectly Telecined or if they
have been edited the sequence may be disturbed.
Some videos are mixed.
There is a chance of a/v sync problems.
It makes them much more difficult to edit in MPEG

[adam]

Its good for more than that. Yes you save about 20% of your bitrate, actually a little less. This is pretty darn substantial though. Imagine being able to use an avg bitrate that is 20% higher, that is definitely an advantage. Also since you have 20% less frames to encode, the encoding will go much faster.

But in my opinion the even greater advantage is that you now have progressive material. CCE and most other encoders encode interlaced footage very poorly. Since its progressive you get a huge increase in quality since it is inherantly easier for any encoder to analyze and encode.

If the footage is properly IVTC'ed according to how it was telecined, than you will never lose audio sync and actually it should be much easier to edit. You just have whole frames so you can cut anywhere you want. With telecined footage you can't cut on any of the repeated fields otherwise you won't have a pair and the interlacing artifacts may be visible at playback.

I think that you will notice a real increase in quality by IVTC'ing your footage even if you have a high bitrate. Interlaced material just encodes poorly in most encoders, Procoder being the most notable exception.

Now that you have progressive material, in CCE you should check progressive and zigzagg scan order.

[FOO]

True, I forgot about encoding, It should work better
on progressive frames.

[SLK001]

I would use these commands:

telecide(guide=1,gthresh=30,post=true,chroma=true)
decimate(cycle=5,mode=2,quality=3)

Tweak the threshholds for you particular video. You will pay a processing speed penalty, but the results are worth the effort.

[pijetro]

Now that you have progressive material, in CCE you should check progressive and zigzagg scan order.

I was thinking the same thing, but will this make a difference for T.V. output, or is this only needed for progressive output (which I don't have)...

Thanx.....

[FOO]

The player will spit it out interlaced no matter what you do.
It's just that it will be better if the encoding was done progressive