Doubts about NTSC film and how batchccews configure cce.

[Talayero]

Hello,

DVD2AVI says the film I want to compress is 29,97 fps, video type NTSC and frame type interlaced.

Well I'm in a pal land and don't have much idea about ntsc. I've ripped the film using doitfast4U with autodetec ntsc option and I see now that in batchccews 2:3 pulldown is checked.

I thought that a pure interlaced film didn't need pulldown. Well, I'm confused. I've made before other ntsc films that were film 100% and then it was also checked the 2:3 pulldown option. Now, with a 100% ntsc I don't understand why the configuration is the same.

Thanks in advance.

[D3s7]

pulldown is based off the framerate the movie was encoded at

If you de-interlace or if the movie is 100% FILM it can be encoded at 23.976 - that will be pulled down

NTSC video must be 29.97 to be excepted.. anything at 23.976 will be pulled down

[Talayero]

Thanks.

1.-Then if I understood well, taking into account that DVD2avi shows that the video I want to compress has a framerate of 29.97 and it's NTSC, not FILM, I should create the d2v project file with the option "Field operation: None"
Is that right?

2.-I thought that with autodetect NTSC, Doitfast4U was able to detect if the video was FILM or NTSC type. But now I see that's not true. With a video that is NTSC 29.97 fps, Doitfast4U has created a d2v file with forced film, an option that must be checked only if the video is FILM type.
So, from now on I think it's better to test manually the video type with DVD2avi before to get it ripped with Doitfast4U. Am I right or I misunderstood something?

[D3s7]

I think you need to step back a minute and somewhat drop the line of thought your on... you are somewhat correct however your mixing ideas

ALL NTSC video is 29.97.. no matter if it's film or video. FILM has a source of 23.976 and is "pulled down" to 29.97 which is NTSC Standard.

If material is detected that's primarily FILM, the d2v is rewritten by Doitfast4u w/ forcefilm enabled and the bitrate for re-encoding is changed to 23.976 (pure FILM)

If the material Is Interlaced, it is mostly left at 29.97 HOWEVER if you deinterlace (which is the default) the .AVS settings to decimate modify the bitrate to 23.976 which again is pulled down after encoding.

You cannot look directly at the dvd2avi information and assume that's what settings are being used from Doitfast4u... The routines Eyes`Only put in for NTSC is VERY VERY accurate and is a result of many testers and experts.

A more accurate way would be to enable the logging in Doitast4u then look at what it sees the video as....

Ultimatly though I guess my question is why are you questioning the settings? Did the resulting movie look strange?

[Talayero]

Honestly, I was questioning the settings because of my inexperience with NTSC format.

One key to understand better is what you said: "If the material Is Interlaced, it is mostly left at 29.97 HOWEVER if you deinterlace (which is the default) the .AVS settings to decimate modify the bitrate to 23.976 which again is pulled down after encoding".
Now I see the reason for that pulldown that I didn't understand.

I live in PAL world and there are a lot of things I don't know about NTSC. With PAL films I can configure CCE by myself when I don't use Doitfast4U and BatchCCEWS, but with NTSC I'm trying to know how to do it and it's not so easy.

I’d like, for instance, to be able to configure CCE for this last movie that I’ve backuped using the big 3. Just to learn. But if I look at the avs file I see the same information as I see in an avs file for a PAL film. This is the script:
import("C:\Program files\DoItFast4U\new.avs\addaudio.avs")
LoadPlugin("C:\Program files\DoItFast4U\new.avs\mpeg2dec3.dll")
Mpeg2Source("VTS__01_P01.4~3_1.d2v",idct=0)
AddAudio()
ConvertToYUY2(interlaced=true)

So, I suppose that if I wanted to compress that NTSC film configuring the cce 2.67 by myself, I should, apart from using the correct settings for aspect ratio, block scanning order, offset line, etc:

1.-Check the df (drop frame) box.
2.-Check the 3:2 pulldown detection box.

And… is that all?

That default deinterlace that you mentioned is already placed in the script? I suppose so, but sorry if I asked questions that may sound silly.