How to convert NTSC to NTSCFilm?

[Fred©]

I captured a 110 minutes VHS at 325x480 AVI (PICVideo MJPEG compressor interlaced option enabled) format with VirtualDub. Quality was good enough. It was a 9,3 GB segmented file.
Well, I frameserved the AVI into TMPGEnc with Smart Deinterlace, VHS and resize filters enabled. I load the CVCD template I downloaded to put the whole movie into one CD (Must be ONE CD). After 17hs of encoding, it finished with a 960 MB MPEG-1 NTSC VBR file
As the file cant fit in one CD, now I intend to convert it to NTSCFilm, to free 20% space that will be enough to stay with +- 790MB...
How do I convert the MPEG-1 VBR NTSC into NTSCFilm? I have just to open the MPEG movie again in TMPGEnc with the same CVCD template and choose Inverse Telecine option? Or it will not work because of VBR mode? Or will I have to demultiplex the stream into M1V, WAV(MP3) and use another software?
Please help because I am lost with this procedure...

Fred©

[fantomlord]

maybe try to just reencode your avi directly as NTSCfilm...I'm not sure, but it's worth a shot.

[sonoma]

I always encode my huffy avi's(480x480) from DSS to NTSCFilm in Tmpgenc.
It seems to work great, and can get an hour show,(44 minutes ofter commercials) to 800 MB with just under full SVCD bitrate. No fuss either using Tmpgenc's wizard to set final size.

[Nelson37]

SFAIK, you're gonna have to re-encode w/IVTC. Turn off the Smart Deinterlace, and lower the bitrate slightly.
First, you must determine if your movie is indeed 24 fps Telecined to 30. Do this by frame by frame analysis looking for a pattern of 3 non-interlaced followed by 2 interlaced frames. This is Telecining. IVTC reverses this process, leaving a true 24fps film.
Remember that removing frames does not reduce filesize, but allows for lowering the bitrate (for fewer frames) and keeping the same quality.
BUT, if your film is not truely 24fps, IVTC will induce extreme choppiness and, IMO, ruin it.

[sonoma]

Does this mean that shows like "Alias" and "X-FIles" recorded off of DSS are originally NTSCFilm, since the come out perfect?

[Fred©]

So, what you say is that there is no acceptible way to convert ntsc to ntscfilm, because what I want is just what you said I cannot have: a smaller file. Is that?

I thought that, only when capturing (not converting from a ripped AVI), I could, at the time of capture, set up the codec with the framerate I needed, with no relationship of the source framerate... I mean, even if I have a NTSC VHS, when played on my PAL VCR it convert the framerate to be correctly shown in my PAL TV... So, the output of my VCR should be the TV frequency, not the source frequency...
With this theory, when capturing I could say the encoder that the source of the capture (the output of VCR) is 23,97 and it would capture less frames and create a smaller file... Am I wrong?

Fred©

[FT Shark]

why bother!!!

[kjmacke]

Like the above post says why bother. Just spilt the sucker in half and put on two disc's.

[adam]

Fred the answer was given to you. You need to determine whether your video originated as film or not. If so then you need to do an inverse telecine. That is really the only way to properly go from ntsc to ntscfilm.

Filesize is determined by bits per sec x the number of secs. Decreasing the number of frames by doing an inverse telecine doesnt decrease the total playtime, so the filesize stays the same. BUT you can decrease your bitrate by %20 and still have the same quality and that will decrease your filesize.

@FT Shark: The reason to bother with converting to ntscfilm is because you can either increase your quality by %20 or you can maintain the same quality and decrease your filesize by %20. If possibly you should always encode in ntscfilm as opposed to ntsc.

[Mntneer]

The big problem I have with NTSC Film for MPEG1 is future transfer to DVD. Instead of just having to re-encode the audio to 48KHz, you have to do a framerate conversion.

Just stick with 29.97, split your film, and bide your time until you can transfer your VCD collections to DVD.

[Fred©]

Just stick with 29.97, split your film, and bide your time until you can transfer your VCD collections to DVD.

Yes, I think I will.

Adam: sorry If I did not saw (see) the answer, because sometimes its difficult to me translate english ( I speak brazilian portuguese)... as I undertood of your post, I will stay with NTSC and will split file into two parts, because a wanted 20% less in file size, but I didnt thought I have to lose 20% of bitrate too...

Thanks for all the answered this post.
Fred©

Visit Brazil 8)