I just finished my project last week. I found after i sync everything together, video and audio got slightly offset. Camera was Red Weapon 8K, my recorder was sound devices 688. I jammed the tentacle from 688 everyday before we shoot and used tentacle to jam Red and i left tentacle attached with RED weapon. we shot on 24 fps.
At post, i found at beginning of the day, audio and video had 1 or 2 frame offset, and the end of the day, audio and video got around 12 frames offset. we normally shot 12 hours a day, and i didn’t jam tentacle in the middle of the shooting, just let it run for the whole day.
is anyone got a idea here or know what it wrong here? why i have the offset?
Are you sure that the Red is constantly looking at the timecode, or does it jam once and then runs on it’s own clock? My suspicion is that the problem somewhere with the Red.
In most cases a tentacle and a 688 would stay in sync within one frame for 24 hours. You can test that yourself as the 688 has a build in offset reader in the JAM window.