I’ve ran across an interesting issue and I’m curious if anyone knows why and how it happened… and maybe ways to prevent it in the future. I filmed a short interview on Sunday, about 18 minutes long. I just did one continuous take, stationary camera—just about as uncomplicated as you can get. For audio, I used a Tascam DR-60DmkII with a shotgun mic, and an iPod using Apogee MetaRecorder with a lavalier mic attached. The audio from each device came out perfect. The video came out perfect too. It’s kind of hard to mess-up an easy set-up like that. The problem comes in post. I’ve imported the 18 minute video and audio into FCPX. I dragged the clips into the project library, got them in sync via the clapboard and started watching. Then, around 4 minutes and 20 seconds the audio starts falling out of sync with the video—ever so slightly. So, I scrolled close to the end of the footage and played from there and found and literally everything was out of sync. The two audio tracks were out of sync with each other and the both were out of sync with the video. How does that happen? All audio and video was recorded at the same time with no problems, and it's all there (no gaps or anything missing). I can fix it easily since the audio will be used over different footage in some places and you won’t always see the interviewee talking. I’m really just curious how it happens and how to prevent it in the future.