PAL to NTSC Chapter Points

[sambat]

Tried converting PAL DVD to NTSC using this link as a resource.

https://forum.videohelp.com/topic312479.html

Used PgcDemux, DGIndex, FitCd, HcGui, DGPullDown, BeSweet, Muxman.

It was OK until converting the original Chapter Points using the information in the post by 'manono'.
In essence, I multiplied the original frame number by 1.1988 (29.95/25 = 1.1988) to get to the correct frame for the video that has 3:2 pulldown applied.
I opened the new muxed video in VirtualDub and went to the calculated frame and found that it did not correspond to the actual chapter transition in the video.
Instead of using 1.1988, I tried 1.25 and remuxed the video.
Loading it into VirtualDub I found the chapter points to coincide with the transitions in the video.
(29.97/23.976 = 1.25) then used VLC to play the video and navigate to the Chapter points OK.



I can't reconcile the discrepancy between 'manono's' conversion factor and my findings and would be obliged if someone can point out where I erred.

Apart from that, the conversion was straightforward (adjusted subtitle position with DvdSubEdit).

[Pinstripes23]

What was besweet used for? Cuz the method you reference the audio shouldn't be touched...only for demux/remux.
I can't tell the discrepency either as it should be 1.1988 (29.97/25). I've never had a problem with the chapter points being in the wrong place when I did these types of conversions.
Maybe go over the steps you did, and especially how you got the original chapter points....then we can see the discrepency.

[manono]

Yep, it should be 1.1988. The only reason it might become 1.25 would be if you slowed the video to 23.976fps when encoding (or when using DGPulldown afterwards). Show us your script.

What was besweet used for? Cuz the method you reference the audio shouldn't be touched...only for demux/remux.

I think you are on the right track there.

[sambat]

@Pinstripes23 - to convert the demuxed 25fps audio to 23.976 (PAL to NTSC preset)
@manono, yes it was encoded with HCgui using the script at 23.976 then pulldown applied.

# -= AviSynth v2.5.8.5 script by FitCD v1.2.8 =-
LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\DGDecode.dll")
Mpeg2Source("C:\Documents and Settings\Superuser\Desktop\_dgindex\extras.d2v")
LanczosResize(704,464,0,3,720,570)
AddBorders(8,8,8,8)
AssumeFPS(23.976, true)
#Trim(0,43074).FadeOut(150)
ConvertToYv12()

[manono]

So, remind me of the reason for this thread again. You encoded at 23.976fps rather than that thread's 25fps, and you're wondering why 1.25 works and 1.1988 doesn't?

It was OK until converting the original Chapter Points using the information in the post by 'manono'.
In essence, I multiplied the original frame number by 1.1988 (29.95/25 = 1.1988) to get to the correct frame for the video that has 3:2 pulldown applied.

If your encoded framerate was 23.976fps, then why would you divide by 25? 29.97/23.976 = 1.25.

[sambat]

In essence you are saying that I mistakenly encoded the video at 23.976 instead of 25?
If so, I would change the script to 25fps , encode then pulldown?

[manono]

In essence you are saying that I mistakenly encoded the video at 23.976 instead of 25?
If so, I would change the script to 25fps , encode then pulldown?

I'm saying you tried to follow a thread about doing the conversion keeping the original PAL length and wound up using a different method - one involving slowing down the audio, video, and subs. You did slow down the subs too, didn't you? Naturally, the chapter points then have to be figured differently than in that thread.

Those are the 2 main "good" methods of doing the conversion. You didn't necessarily do anything wrong. Me, I reencode them to 23.976fps myself, to get rid of the PAL speedup. But I also know how to figure the new chapter points, whichever method I use.

[sambat]

Obliged.