Time drift persists in Logic Pro despite fps and sample rate adjustments

I recorded a two person interview with this set up.

  • iPhone 13 video camera with lapel mic as source
  • Garage Band on iPad Pro with 2 channels of audio in put

The interview is roughly 40 minutes long.

I pulled the files into Logic to produce them and had the expected time drift due to the different sample rates and fps standards.

After modifying the files to match fps and samples the time drift persisted.

  • I rendered the video file at 29.97 fps (down from 29.98) using hand brake
  • I resampled both audio files from 44.1K to 48K in Logic using "copy/convert file"
  • I modified the Logic Project settings to reflect both 29.97 fps and 48K sample rate.

Is there something that I'm missing?



[Re-Titled by Moderator]

iMac 27″ 5K, macOS 13.7

Posted on Jan 4, 2025 01:12 PM

Reply

Similar questions

1 reply

Jan 4, 2025 02:05 PM in response to JMCound

Two individual digital devices - two individual clocks.

As long as the devices are not clocked-synced, it's unlikely that they will not drift. This has nothing to to with sample rate or frame-rate. This is why professional hardware like sound card, recorder, camera... provide sync options (like word-clock, digital sync or similar...)

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Time drift persists in Logic Pro despite fps and sample rate adjustments

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.