Audio drfiting out of sync in export in Premiere v24.0

[kayhlc53509618]

Hi,

Wondering if anyone else is having this issue. 

I am exporting a long file— approximately 37 minutes. By the end of the clip, the audio has drifted pretty massively out of sync.

• It's not this way in the timeline.
• It is not just playing back this way in quicktime (also VLC, upon upload)

I am exporting with:

• Matched frame rate to source — 23.976
• Matched audio to source - 48KHZ
• VBR 2-Pass (65, 150)
• H264

I never saw this issue until updating, but I'm not sure if that's specifically the problem. It takes a long time to export, so iterative troubleshooting has been slow. 

I'd appreciate any thoughts. Thank you!

[Richard M Knight]

Is it variable frame rate footage?

[kayhlc53509618]

No, it's CBR — Canon C300mkii footage, never had a problem with it before and nothing I can think of has changed. 

[kayhlc53509618]

Sorry, CFR*** I mean. 

[Peru Bob]

Check the Audio Hardware Preferences. Default Audio Input should be set to No Input.

[kayhlc53509618]

Tried switching this to no success unfortunately. 

I'm trying it with "Mercury Playback Engine Software Only" right now, but would rather not have to do that on every export...

[kayhlc53509618]

Update note:

• Doesn't happen in Prores422, but I export these length videos often for web and don't want to do a double export every time, so not an ideal solution
• Doesn't happen in VBR 1-pass, only in VBR 2-pass (it seems so far). But similarly, I would rather use 2 pass so I don't get that ocassional low qual frame that happens often for more in 1-pass. 

Any thoughts are very appreciated. Thank you.