Max Winik wrote:So I added a Teranex Express to the mix. Converted the signal to capture at 24FPS in Media Express. When I go to sync with my 24 FPS film scans, the audio is still falling out of sync by about 15 frames for every 10 minutes. Using Davinci Resolve 12.5. My timeline is also set at 24fps. Does anyone have any other suggestions?
I think this is not the way to do it.
If you are doing a real-time capture/conversion, you will be digitizing at 29.97/23.98 (really 23.9754-etc). This is not 24.0000.
15 frames per 10 minutes seems to underscore the causative factor. Simplest solution might be to reassign the film scan dpx sequences to 23.98 and abandon the idea of 24.000. When the audio goes out of sync, does it lead or lag? My bet is that the audio is still running at equivalent to 29.97 (slow and eventually lags -- gets later and later.) This is also similar to drop-frame clock time mismatch. The error factor to watch for is 1001/1000.
This is a problem from the beginning of double system telecine transfer. Cinematographers used to
always shoot at 24, with a Nagra recorder set at 30 fps. Transferring film from a Rank/Spirit slowed the frame rate to 23.98... 3/2 cadenced to match NTSC 29.97. The Nagra 1/4" tapes also had to be slowed to match the mechanical gate-sequence of the film scanner. If you are doing a real-time Teranex conversion, it is still operating in
real time and you are
not getting a 29.97--> 24.000 speed-up, you are getting a frame-blend interpolation.
jPo, CSI