Need some help with a synch problem

[kotyczka]

Hi, I hope this is the right forum for my problem.

I'm preparing a movie for publication on DVD. Mainly I generated
subtitles, but I also took a look at the video and audio source.
At the beginning of the movie there is a company logo (Toei)
for 13 seconds showing two waves of water rolling to the coast.
This intro clip had a rather bad video quality, while the rest
of the movie looks excellent. I got a great assistance in the
forum to restore the intro clip. Among other things there were
duplicate frames (10 or so), which are removed now.

However video and audio of the intro are totally out of synch
now. Since the video is done now, I'd rather like to shift/stretch
the audio appropriate. No problem to do so - if only I knew, how
much I had to shift/stretch/insert/...

Moreover, video and audio seem to be out of synch even in the
original source, so I can not compare to the original. I have no
idea of the history of the intro clip - maybe it was converted
from NTSC to PAL, but that's just a wild guess.

In the audio editor I can see the two breaking waves very clearly.
They start, come to a maximum of volume very quickly and fade out.
The only thing I really miss to find out is, at which 2 frames
I should place the volume maxima. (If I try it again and again
at the end I loose the feeling, what's right or wrong).

Could someone with a good feeling for synch take a look at the
intro clip and give me some advice where to put the wave maxima,
please?

The clip is at http://www.megaupload.com/?d=UCW22JRS (9MB).

[jack<the>ripper]

had a quick look , it was converted from ntsc to pal ,
does the rest of the video get progressively worse or is it only in the intro .?
the first wave hits 500Msec out and the second hits at 1 second out ,
but then the cartoon characters are back around 700Msec
i would strip the audio out , time stretched and re mux

[kotyczka]

had a quick look, it was converted from ntsc to pal, does the rest of the video get progressively worse or is it only in the intro? the first wave hits 500Msec out and the second hits at 1 second out, but then the cartoon characters are back around 700Msec i would strip the audio out, time stretched and re mux

Thank's for your reply.

First of all, the problem is completely solved now because I managed to find the same clip in PAL in a much better video quality and completely synchron.

Second, it is just the intro, the rest of the movie is OK, both in quality and in synchronity.

Third, I already did try some time streching (before I got the better material), and there I had a strange effect. The audio is DD5.1, so I extracted 6 individual channels. For time sreching I use Audition 3. Each channel sounds well after time streching, but if I recombine the streched channels again to DD5.1, it sounds very strange. Taking a look at the stereo field it seems that the sound source is moving rapidly from the left to the right and from the front to the back. The streching algorithm seems to add something, but not in the same manner to each channel, but rather randomly to each individual channel. Is there a well known method to time strech several channels simultaneously and in a good quality?

[jack<the>ripper]

no not yet as ac3 is highly compressed and from dd to ac3 can be difficult . . but i did time stretch it at about 28% and was almost correct
, myself i would just cut and overlap the audio with a fade out and fade in on the two overlap pieces (to keep the volume the same ) because it was water and ocean
out of sync audio in this way is hard . apparantly eac3to is ia great program for time streching ac3 but i havent had a look in depth yet

good luck , glad you found better quality .