I did the latter of what Michael proposes on the last two features I helped with. I went to Cineform first which embedded the timecode into the file so there was no “interpretation” of the timecode by the multiple editing systems being used. Also, the Cineform file became my new master for DI for the reasons Michael mentions.
If you work directly from the original .mov files, then Avid creates a timecode based on creation date. This is helpful from an organization POV when asking looking for a shot from “last Tuesday afternoon…”
But if a downstream process doesn’t interpret the same way, you may have an issue with the conform being 1 or more frames off. In that scenario, you can always enter 00:00:00:00 into one of the Aux TC columns and use that for an EDL as it will be a frame offset from zero (head of file) which any system should be able to do.
Michael
Michael Phillips