24000/1001 to 24. Stupid?

[invisible]

The way I understand it, films that are originally 24 fps, which are most old ones especially were slowed down to 24000/1001 for NTSC compatibility. So what if I restore DVD rips to 24 fps to restore the original speed? What is your opinion on that?

[Ghitulescu]

You can't restore a DVD to 24fps and keep it still as a DVD. You can restore it to 24fps if you like, but you have to pick up another format (I'm not sure about BluRay).
AFAIK, there are movies done at 24 and movies that are done at 23.974.

Bottom line: what do you expect to gain from this?

[burfadel]

Well even if that is the case, you really won't notice it! its not like viewing film/ntsc material in standard PAL which is sped up to 25fps. In you case, a 100 minute movie would be 6 seconds longer, its not like NTSC --> PAL50 which would be ~4.5 minutes shorter!

[Keiyakusha]

invisible
As burfadel said, unlikely you will see the difference. And to do it right you also need adjust the audio which will degrade its quality.

[MatLz]

24000/1001 to 24. Stupid?it's definitively LESS stupid than make 60...120 or more fps with 23.976...(and there are a lot of stupid threads about that...:D)

It's possible...just do it!;)

[invisible]

You know, the sound issue is the one thing which sucks in this case. Stretching options for ac3 or dts in mkvmerge don't seem to work. Sound needs to be rescaled and encoded again. I think this is best for turning PAL movies into 24.00 fps theater speed, which works like a charm. For those of you who want to do this and haven't, just remember to consider the sound scaling; usually you want to simply change the wav speed, not the tempo which maintains the sound pitch. With that, even the sound is more theater accurate, most of the time. I haven't run into a single PAL movie which accounts for pitch in speeding up the sound to 25 from 24. Same thing for 24000/1001, except it's less of an issue. And for those that said it, you're right, it's not very noticeable but it's there regardless. It is noticeable for PAL. Btw, sound needs to be changed -4% in audacity for the PAL to 24 change.

[rotty]

The way I understand it, films that are originally 24 fps, which are most old ones especially were slowed down to 24000/1001 for NTSC compatibility. So what if I restore DVD rips to 24 fps to restore the original speed? What is your opinion on that?

I take it that from the original thread title, you were asking "is it stupid to want to do this", 23.976 fps up to 24fps

Well I suppose you should ask yourself, at what point would I NOT bother, for example, would you want to bring it up to 24fps if it were at 23.999fps.

I would have thought that 23.976fps was probably within the error tolerance of cinie projectors anyway. You have probably watched films at the cinema that are more in error than this.

I know that someone is going to say that probably modern projectors are probably Xtal controlled.

As for being able to perceive the difference, you sure wont.

[lnatan25]

I suggest using ReClock. No reencode needed, and can speed up audio properly. :)

http://forum.slysoft.com/showthread.php?t=19931

[invisible]

I figured out a much better way to do PAL 25 to 24 - simply during playback. In mplayer the keyboard shortcuts can be set in input.conf
The thing to do is to set:
[ speed_mult 0.96
Then pressing [ during playback will reduce the speed to 24. I'm not sure about 24000/1001 to 24 but maybe it's 1.001 ?