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Lesson 17. Lesson: Operational Troublesh... > Audio and Video Progressively Out of...

Audio and Video Progressively Out of Sync

Symptom #1: Clips Go Rapidly Out of Sync and Exhibit Audio Artifacts

“My clips go rapidly out of sync in the Viewer or sequence, in addition to hearing the beeping sound saying FCP wants to render the audio. I may also hear some crunching artifacting noises.”

Background

Using the correct sample rates in your capture settings is critical for avoiding out-of-sync audio. FCP and QuickTime use the number of samples per second to determine the timing of audio in playback. If an audio clip is identified as having been sampled 48,000 times per second (48 kHz), FCP plays it back at 48,000 samples per second. If the initial identification of the sample rate is wrong, FCP will be busy performing a sample rate conversion so that the file’s playback rate matches your sequence sample rate.


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