How to sync Picture at 25fps and Mixed Stereo Audio at 24fps

Here is the scoop on 24ps to 25fps.

Tue, Dec 19, 2000

1.  If your program (film) is telecined at 25fps and your sound is 6 track or 2 track at 24 fps then do the following:

Option 1- 

In a studio with Akai DD8 and DigiBeta

2.  Dump the audio 6 track tape to MOD (Magneto Optical Disk)
3.  Lock an Akai DD8 to the DigiBeta or Beta VTR using word clock
4.  Pitch up the Akai DD8 to 25fps and layback the sound to the VTR

Option 2- 

In a studio with DA88 and DigiBeta

1.  If your tapes are on DA88 then lock the DA88 to the VTR
2.  Use the varispeed and run at 25fps.
3.  Layback audio to the VTR

note: keep checking sync every 10 minutes or every reel as there may be a chance that the audio drifts a bit. If this happens then stop and start again from the point where the drift begins.

If you keep to 10 minute sessions then the audio will not drift.

Option 3-

In a studio using ProTools

Version 4 and above of ProTools have a Pitch and time shift plug-in.

1.  Select the Pitch Shift Plug in
2.  Uncheck <Adjust Length>
3.  Enter the value 4.1666667
remember the last digit must be a 7.

Now compress the tracks.

If you find various artifacts entering because of phase difference you may need to use an additional plug-in which cleans up all artifacts.

You may also call Senthil Kumar at 91-44-826-8714 or Baylon at +91-98210-14893 for more information.