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25 Jan 2021
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Audio slightly out of sync on export with M1 mac and Big Sur 23 Mar 2021 22:55 #113608

I noticed that my new M1 macbook pro, any video I export with Final Cut Pro has the audio about 2 frames slightly earlier.

I can see that if I import a video that was already exported, the audio waveform doesn't match.

This isn't the case for my old 2010 Macbook with High Sierra.

I usually do File -> Share -> Audio Devices 1080p -> Format Devices: Apple Devices. Video Format: H.264 Faster Encode

The sync is fine if I use Apple ProRes 422 but that makes 4 GB files from a few minute video, and I never had to use anything other than H.264 in the past.

Anyone know why this is and what can I do?

Final Cut Pro version is 10.5.2. Tried other versions too.
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Last edit: by David814.

Audio slightly out of sync on export with M1 mac and Big Sur 25 Mar 2021 15:51 #113667

I'm looking around and I see others have the same issue with M1/Big Sur of audio shifting 2 frames earlier
www.fcp.co/forum/4-final-cut-pro-x-fcpx/...nsync-when-exporting

Could this just be a bug with Final Cut Pro in M1/Big Sur? Anyone use M1/Big Sur and have audio shifting not happen when doing H.264 export?

I wonder if Compressor would help. But it's $50 and I don't see a trial for it. $50 just hoping it might work.

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Audio slightly out of sync on export with M1 mac and Big Sur 25 Mar 2021 16:46 #113669

Can you please give the specifications of your media and your project properties?

There is no trial for Compressor.

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Last edit: by Tom Wolsky.

Audio slightly out of sync on export with M1 mac and Big Sur 25 Mar 2021 16:48 #113670

The linked thread does not involve an M1 computer. The OP upgraded to Big Sur. All M1 machines came with Big Sur installed.

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Audio slightly out of sync on export with M1 mac and Big Sur 26 Mar 2021 06:59 #113676

I was trying this but it happens with any video I try. The audio will come out 2 frames earlier. That doesn't happen with my old macbook and High Sierra with the same files.

Perhaps it could be a Big Sur issue rather than M1 if OP is having the same problem after upgrading to Big Sur?

Thanks
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Audio slightly out of sync on export with M1 mac and Big Sur 31 Mar 2021 04:56 #113773

Update: I bought Compressor just so I could see if it would help and what's happening.

The issue seems to be with exporting the AAC codec. If I change the audio codec from AAC to linear PCM, then it stays synced and the audio does not shift earlier by 2 frames. Even though the source is AAC.

Does that make sense to anyone? Exporting using AAC as the audio codec causes it to be out of sync a little. (Even though the source file is AAC)

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