NTSC to PAL Conversion Guide??

[sue denim]

Hi!
Do any of you guys know if there's a 'definitive' NTSC to PAL conversion guide out there somewhere?

I've got little bits of info from various sites but none of it seems to fit together into a complete process!

How do you guys do it??!!??

Any help or advice would be much appreciated.

Sue xxx

[Truman]

http://www.vcdhelp.com/phpBB/viewtopic.php?t=76803&highlight=ntsc+pal
http://www.vcdhelp.com/phpBB/viewtopic.php?t=76832&highlight=ntsc+pal
https://www.videohelp.com/phpBB/viewtopic.php?topic=71671&forum=3
https://www.videohelp.com/phpBB/viewtopic.php?topic=70563&forum=3

It is not recommended to convert the framerate, either a couple of frames get duplicated or get skipped. If you have a 23.976 source just speed up the movie a little.

[SupaCoopa]

I second that request.

I have found some tips on converting 23,976 fps NTSC Film to PAL, what about 29,97 fps NTSC then?

[Truman]

I am not familar with NTSC and I dont have a 29.97 source to test with ( I am on 56k )
But if you just convert 29.97 to 25 fps you will end with jerky playback.
Hope someone have a decent solution, I would like to learn it.
Before you are going to convert the framerate I suggest to try to play the NTSC. Most dvdplayers should support both systems.

[t0nito]

Hi! Read my post "Perfect Conversion of NTSC to PAL without judder" on the advanced conversion topic. I hope this helps you. I it works very well.

[sue denim]

Hey, Thanks a million you guys!

Some really great tips there........ Will let you know how I get on.

Time to get busy!

Laters,
Sue xxx

[sue denim]

Hi ..... Back again!

@ Truman .........

I've just checked out some of the links you posted for me - thanks again!

In one you mentioned an AVISynth method using AssumeFPS(....)

Does this really speed up the video AND keep the audio in sync? Without ANY glitching???

If so, I'm amazed
AVISynth just gets better and better the more I use it!

I'm gonna try that first 'cos I'm using an .avs script as it is to resize the video.

So what would you suggest is the best way to convert 29.97 to 23.97 ??

Sorry to keep bugging you and thanks for all your help,

Sue xxx

[Truman]

In one you mentioned an AVISynth method using AssumeFPS(....)

Does this really speed up the video AND keep the audio in sync? Without ANY glitching???

23.976 to 25 fps work work well with Avisynth 1.0beta5, 25 to 23.976 does not work with beta 5. Probably on should try beta 3 or the old v.0.3.

As mentioned, I have no clue how to convert 29.97 to 23.976. If you "convert" 29.97 to 25 fps using AssumeFPS, the video would be ~16% slower/ longer than the original. I cant believe, that this is acceptable.
However, 23.976 to 25 / 25 to 23.976 is not a problem. If
AssumeFPS(fps,sync_audio=true)
does not work, you can do the audio conversion seperately with BeSweet (OTA).

[sue denim]

Thanks Truman - you're cool 8)

Assuming that 29.97fps is in fact NTSCfilm at 23.97fps 'notched up' to be NTSC compatible, which nearly all US DVDs are, I think there's a util out there on the net that can 'reverse engineer' that process so as to bring the video back to it's original 23.97fps.

The AVISynth method should then work well ....... Cheers!

Sue xxx

[Truman]

I think, I have to read a guide . I have no idea, how this 3:2 pulldown stuff workes.

[Truman]

Finally I gave up on AssumeFPS. It works fine if the target framerate is multiple with 5, i.e. 20,25,30 etc.
Also this worked for me:

Avisource
AssumeFPS(2997/100,sync_audio=true)

But

Avisource
AssumeFPS(2398/100,sync_audio=true)

and

Avisource
AssumeFPS(23976/1000,sync_audio=true)

did not work. This is really weird. Same results with Avisynth 1.0 beta 3, 4 and 5. Avisynth 0.3 do not have this option at all.
I stay with seperate video and audio conversion. Anyway, one can use this sync_audio =true line only when the avi contain audio. With a seperate WAVsource it does not work at all.
So I use AssumeFPS without "sync_audio=true" and do the audio conversion with BeSweet.
Also I dont think, that there is a good solution to convert a real 29.97 fps source to 25 fps.