wrong framerate?

[Dragonsf]

I want to apply a second soundtrack (german) to a NTSC movie.
The Movie (Avanti!) ist exactly 2:24:08 long. After demuxing with VobEdit, I got some strange results:
- the audio (AC3) ist 2:24:08 long
- the video is 2:00:00 long

Using Vdub-mpeg Mod, I can see, the video is 720x480 @ 30fps, but the audio is 25fps. Playing Video+ audio (after converting to .wav), audio is completely out of sync (as expected).Changing the video's framerate to 25fps doesn't work eitherync is better, but not really good.

Question: how can a 30fps NTSC video end up as a 25fps video?
23.997 I could understand, but not 25fps.

[nufan292]

Could it be hybrid, or VFR?

[Dragonsf]

Could it be hybrid, or VFR?

I don't understand 'hybrid' here (PAL/NTSC mix?). And VFR? Is that possible? Only thing I forgot: it uses progressive frames.

[guns1inger]

If you put the disk in your stand alone player and call up the info display, what is the movie run time ?

[Dragonsf]

As advertised:2:24:08

[guns1inger]

A quick back of the envelope calculation says that the audio would be 2 hours at 30 fps - ((144 * 25)/30)

Don't slow down the video, speed up the audio.

[Dragonsf]

That's right:but speeding up the audio gives very strange results:high pitch and fast talking.I tried this with besweet's AC3 fps conversion.
It's around 16% speed difference and really audible.

[guns1inger]

The short answer to your original question is - it can't. If it is NTSC, then the framerate must be either 23.97 or 29.97. To me, this means something has gone awry with the demux. Either ifoedit screwed the pooch, or something got chopped.

Is the audio a constant time frame out of sync, or does it drift further out as time goes on ?

Have you listened to the end to make sure the last (or indeed, first) 24 minutes aren't missing ?

[Dragonsf]

I demuxed with VobEdit, BeSweet and DVD2AVI:audio is always the same.

I looked at demuxed video output from VobEdit/DVDDeCrypter and DVD2AVI: all the same:VDub says:30fps but only 2:00:00 length.

I had a look with DVDPatcher and it states:NTSC 720x480 @ 30fps

BeSweet says:AC3 Audio @ 25fps as HeadAC3 says the same.
For me it looks like, the audio was done at 25 fps and the Video at 30fps and muxed at 25fps .

The Audio file is complete, nothing missing and nothing added.The sync drifts away with the time.(i.e the video is faster than the audio)

But: I used tmpgenc to cut the first 10 Minutes of the video and used CoolEdit Pro to save the first 10 Min of the new audio.After converting the 10 Min audio to AC3 and remuxing, the audio is in sync. That's stranger than anything.