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Since this is a digital format, wouldn't frames be arbitrary? There is not a real "frame" in digital, because it is a continuous capture.
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For the audio yes, but not for the picture that it's is in sync with-- that is still one discrete field after another.
This 23.98 vs 29.97DF is a real issue that we need to be aware of. For instance: I recently came across a show that that was shot at 23.98. The offline was also at 23.98, but the online is at 29.97DF. The first problem was that all the lengths of the acts were off because 23.98 doesn't match the clock on the wall (video editor's problem-- not audio's!)
Additionally, when we say that 23.98 TC matches 29.97 TC on the seconds, but not the frames-- this is true,
but if the audio guy is working on 29.97DF and the offline editor is working on 23.98,
that doesn't apply. The timecodes will drift with respect to each other by about 3.3 seconds over an hour. That makes manually syncing a shot change a real nightmare.
-Richard