For the last 5 years, I have been shooting a video podcast using two cameras: one on the host and the other on the interview subject. The high-quality audio for both people is recorded on the subject's camera and the host's camera just uses the camera mic.
When it comes time to edit, I sync up the audio tracks (and video) from both cameras, remove the host's poor audio track and I now have perfectly sync'd audio that matches the host's lip movements exactly. I've done it this way for 122 episodes without issues until today.
Today, I did the same thing as always, but on this day, the audio and video start out perfectly sync'd up, but over the course of about 5 minutes, the host video no longer matches the subject's audio track and is roughly 15 seconds longer that it should be when the video ends.
The host's camera mic audio still syncs with the host video just fine the entire time- and it matches the subject's audio at the beginning too...until it drifts- locked with the video.
I shot two other podcast episodes that day before this one and an additional one after and these edits turned out fine and had no issues at all.
What is going on and how do I fix it? Thanks
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