- April 29, 2021 at 3:07 am
Hello, first posting here.
I’m having a problem with Premiere via Quicktime. I’ve been editing long (1 hr+) Zoom sessions for a local university. I receive the files in mp4, convert them to Quicktime ProRes 422, and match all the source settings to my export settings (H.264, optimized for YouTube). Everything is 16-bit, 48K. The problem is, when I open the exported files in Quicktime, the audio will be out of sync (and not consistently–i.e. parts will play out of sync, then when you scrub back and play them again, they are back in sync). The files play fine in other programs (Logic, re-imported into Premiere, After Effects etc). And it’s not just my machine, my girlfriend played the file on her computer and the audio was corrupted as well. Also, when I upload the videos to Google Drive, Box, or another host, they play fine. Seems like it’s only Quicktime that has a problem. And it also seems like the longer the video, the worse it gets. Has anyone experienced this, or have ideas why it would be happening?
- April 29, 2021 at 3:41 pm
Welcome to the forums! I’m not sure what is going on with it if you are transcoding to ProRes 422 48k, and editing with matching settings. But I would try to render out an intermediate ProRes file – it will be considerably larger than your h264 mp4. The render out of PPro should be pretty quick if you use the same ProRes settings. Then use AME to transcode that ProRes file to an h264 mp4 file. Does that do the same thing?
A lot of times audio drift can happen when using h264 mp4 files that are a variable frame rate, or audio settings don’t match up across the board – from original file, sequence settings, to export.
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