Movie speeds

[drmrsolds]

I have two movies, one Pal, one NTSC. As far as I can tell they are identical. But the total time is different, one shows 75 minutes, the other shows 78 minutes. When watched at the same time, one goes faster than the other. I need both to go exactly the same for 3d conversion.

[hech54]

You have MUCH reading to do.

[Gavino]

If two identical movies is really what you want, why not just copy one of them??????

[Anakin]

The PAL one is playing at 25fps
NTSC is playing at 29.976fps.

What that means is, every second the PAL one is playing 25 frames in one second while the NTSC one is playing 29.976. 4 frames difference. By the time you get to the end of your 78 min movie, there will be a 3 min gap or so like you have seen. Nothing is missing, it is just playing at a different frame rate.

[drmrsolds]

One movie is the 2d Left eye version(NTSC), the other is the anaglyph 3d version which I am converting to the 2d right eye for stereoscopic viewing. The PAL I have tried to covert several ways from 25 fps to 29.97 fps, but the total time of movie is still 75 min.

[Gavino]

What that means is, every second the PAL one is playing 25 frames in one second while the NTSC one is playing 29.976. 4 frames difference. By the time you get to the end of your 78 min movie, there will be a 3 min gap or so like you have seen. Nothing is missing, it is just playing at a different frame rate.

Your arithmetic doesn't stack up. Speeding up from 25 fps to 29.97 would produce a gap of approx 15 mins over 78 mins.

More likely, the PAL version is progressive and has been speeded up from the original 24fps to 25fps, which would make it run about 3 mins quicker. Conversely, the NTSC version will have been telecined from 24fps to 29.97, keeping its duration the same as the original.

So I think you will need to IVTC the NTSC version to make them frame-by-frame equivalent.

[manono]

The PAL I have tried to covert several ways from 25 fps to 29.97 fps, but the total time of movie is still 75 min.

Your reasoning is wrong and your conversion software sucks. It's adding duplicate frames to convert to 29.97fps and the length remains the same. What you really want to do is slow it down to 23.976fps to make the film the 3 minutes longer at its true NTSC framerate.

[Cornucopia]

OK, so let's assume that you follow the above (good) advice and:

1. Change the 25fps PAL to 24fps (slowing down the audio as well).
2. IVTC the 29.97 NTSC to 23.976fps.

You still will have a VERY SLIGHT mismatch, and it depends now on which way you want this to go: PAL or NTSC. If you want to go PAL, you have to slightly speed up the 23.976 to 24fps. If NTSC, you want to go the reverse (usually).
EDIT: (this last part didn't look like it made sense) the 24fps is likely the common factor, so it makes sense to revert to it for matching, but you don't have to if you KNOW you're going to end up with only one system. However, to have a "universal" master, it probably makes the most sense to use the 24fps.

PLUS, assuming the above gets worked out, you still have frame size issues. IMO, for ANAGLYPH -> Full color work, this is a much bigger problem. You'll be resizing, which means blending/interpolating, which means boundaries are going to get fudged - exactly at the time when you DON'T want them to. I deal with Stereo3D work, so I'm familiar with this.

I wish you good luck, but don't expect too much.
I wish more that you'll find material that uses the same system.

Which title is it?

Scott

[drmrsolds]

I figured out the speed issue, Thanks. I used tsmuxer to change the fps and the times matched up perfectly. By the way the movie is "Battle for Terra". I am also workingon Polar Express 1080p and having luck with mixing the red back into the right eye with the "Nuke" program. Pm me if you want to talk about the 3d stuff, I have lots to learn, I have the 3D DLP setup running and am trying to get movies converted.