Need help from some one that knows Interlaced.

[BlueFlame]

Hi
I have read the Doom9's guides, and the articals you guys have provided. I still can't grasp it. I can do non interlaced films with no problem. click..click..click..encode Simple! :)

I have 5 DVDs that are the same, interlaced. I hope if I provide the info, some one that knows interlace, can say, just click and choose these setting. :)

OK, in DVD2AVI preview I get:

Aspect Ratio: 4:3
Frame Rate: 29.970 fps
Video Type: NTSC
Frame Type: Interlaced
Also, I have the tiny lines during Preview.

Can some one please simply tell me the settings. Thank you.

With the info provided above, fill in the blanks.

DVD2AVI -> Field Operation -> ?
File -> Save&Encode -> Field Operations -> ?

Should be simple. ;) Thanks guys

[jggimi]

These "sound" like they are true interlaced NTSC, based on your description.

DVD2AVI: Make sure Force FILM is turned OFF. You'll need to set Field Operation to None to do that.

You should use either "fast" or "field" de-interlace. I cannot tell you which to use. However, you can determine which looks best by running a test. You can take the preview .avs and examine it frame by frame, or, you can create a small excerpt project in dvd2avi using the [ and ] buttons. Try it with both ways and determine which looks the best to you.

There is a bug with Fast Deinterlace and GKnot 0.26. There's a sticky in this forum that will tell you how to circumvent the problem.

[BlueFlame]

Thanks jggimi :) Don't get many hits in this forum.

[balbrain]

Originally posted by BlueFlame

OK, in DVD2AVI preview I get:

Aspect Ratio: 4:3
Frame Rate: 29.970 fps
Video Type: NTSC
Frame Type: Interlaced
Also, I have the tiny lines during Preview.



Ayte. i have a DVD which gives me exactly the same stuff in a DVD2AVI preview. when u say 'true interlace' does that mean every frame is interlaced? If so, DVD2AVI preview may not be the best thing to jusdge that, right? I actually moved frame by frame in DVD2AVI and see that every 2nd frame has interlacing artefacts, i.e. the pattern is

No Artefacts - Interlacing Artefacts - No Artefacts - Interlacing Artefacts .......

Therefore 50% of the frames are interlaced? Can I take this to mean 2 outta every 5 frames in interlaced (And perform IVTC)? becos, when u say 2 outta 5 frames it is relative isnt it, whether the 1st frame starts out being interlaced or not. For examlpe in my case, if I check 5 frames in a row with every 2nd one interlaced, then if the 1st of my 5 frames is interlaced then 3 outta 5 are interlaced, else 2 outta 5. Hope I have not confused the issue :)

So the question is, Can I do an IVTC or do I have to deinterlace?

Thanx

--balbrain

[jggimi]

I don't think dvd2avi provides frame-by-frame images. There are buttons, but they seem to jump multiple frames.

So, I've found it easier to make a small test project (using the [ and ] buttons) and look at the frames in the Vdub or Gknot. Those provide accurate single frame advance.

I recommend you try that instead.

[balbrain]

Thanx. I tried that. It seems that I have 3/5 frames interlaced. Although I am confused. When you look for interlacing artefeacts, is even the smallest artefact considered? And are we talking about every five frames taken as 1 to 5 - 6 to 10 - 11 to 15 or any group of 5 frames?

Anyway. Assuming 3/5 frames are interlaced. What do i do? IVTC or Deinterlace. I already tried IVTC. the output is OK but seems diffused/blurred at edges of moving objects (like peoples faces). I should try deinterlace. which one do you reccomend? Maybe I'll try trbarry's TomsMoComp?

Thanx

--balbrain

[jggimi]

If you're using GKnot 0.26, the "IVTC" by default uses the DeComb filter suite; specifically the Telecide/Decimate filters. You'll see it in the .avs script.

You can try setting different parameters, there is a DeComb help file in the Gknot ../Docs folder.

You won't need to go through a complete re-encoding. Just edit the .avs file, and then open it in Vdub and examine the filtered video. You'll be able to quickly see what happens when you alter settings. Once you've got something acceptable, then run the encoding with that .avs script.

You can also use GreedyHMA; by default it's commented out in the script, and parameters can be found in the ../Docs folder.

[CaPPyD]

Originally posted by balbrain
For examlpe in my case, if I check 5 frames in a row with every 2nd one interlaced, then if the 1st of my 5 frames is interlaced then 3 outta 5 are interlaced, else 2 outta 5.

If from your first 5 frames, you have 2/5 and from the next 5 frames, you have 3/5 then this is not 2/5 total... This adds up to 5/10 which is 1/2.

[vybez]

Now, I don't know if this is the "right" thing to do (as I'm no expert), but I've had a couple of dvd:s that had the same attributes:

Aspect Ratio: 4:3
Frame Rate: 29.970 fps
Video Type: NTSC
Frame Type: Interlaced
Also, I have the tiny lines during Preview

Here's how I solved it:

In DVD2Avi used Force Film to perform IVTC (29.970 -> 23.976 fps).
Then in Gordian Knot used Fast Interlacing to de-interlace.

This has worked every time for me.

Remember to edit the avs if you're using GKnot 0.26 Beta,
because of the fast interlace bug jggimi mentioned; http://forum.doom9.org/showthread.php?s=&threadid=25756
That applies both to the "movie.avs" and "moviecredits.avs" should you encode the credits separately.

Hope this might help!

[balbrain]

Originally posted by vybez
Now, I don't know if this is the "right" thing to do (as I'm no expert), but I've had a couple of dvd:s that had the same attributes:



Here's how I solved it:

In DVD2Avi used Force Film to perform IVTC (29.970 -> 23.976 fps).
Then in Gordian Knot used Fast Interlacing to de-interlace.

This has worked every time for me.

Remember to edit the avs if you're using GKnot 0.26 Beta,
because of the fast interlace bug jggimi mentioned; http://forum.doom9.org/showthread.php?s=&threadid=25756
That applies both to the "movie.avs" and "moviecredits.avs" should you encode the credits separately.

Hope this might help!

But how can you use Force Film for an NTSC source. Wouldnt it give garbage ;) according to DVD2AVI specs??

[vybez]

About your question - I don't know :(
As I said - I'm no expert..

I was just trying to help with a quick and easy method
that has worked for me (with the DVD:s that I have).

[CryptKeeper]

I also did what vybez did
tho i chose Smart Deinterlacing instead in Gknot
when saving the avs

and right now im backing up another dvd with the same specs
and it's working like a charm

no interlace lines and scene changes come out smooth