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VEGAS Pro 23 – Nested Compound Clips + Optical Flow Causing Audio/Video Sync Iss
Hi everyone,<div>
</div><div>I’m working on a project in VEGAS Pro 23 where I’m using a mixture of 29.97 and 59.94 FPS footage. My project is set to 29.97 FPS.</div><div>
</div><div>I have a few clips that I’ve slowed down using Optical Flow, and those clips are inside nested/compound sequences because I have some additional effects and masking applied to them.</div><div>
</div><div>The problem is that after nesting the clips, the slowed-down sections occasionally become slightly out of sync with the audio. The preview looks correct initially, but after rendering or reopening the project, the video seems to drift by a few frames</div>replied 1 week, 3 days ago 2 Members · 1 Reply
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1 Reply
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Hello there!I’ve run into similar issues when mixing frame rates with slowed-down footage. One thing I would check first is how the Optical Flow clip is being handled inside the nested sequence. Since your project is 29.97 but you’re using 59.94 footage, I would try keeping the 59.94 source at its native frame rate and doing the speed change within the nested sequence rather than changing the project/timeline frame rate. I’d also try rendering one of the problematic nested clips to an intermediate file first, then replacing the nested version with the rendered clip. If the sync issue disappears, that would point toward the nesting/Optical Flow combination rather than the original footage. Also make sure the audio isn’t being time-stretched along with the video when you’re changing the playback rate. If the audio is supposed to remain at normal speed, I’d separate/lock it before experimenting with the video speed. If you’re still getting the drift after rendering the clip separately, I’d check whether the source files have variable frame rate (VFR), since that can cause some strange timing issues in VEGAS. Hope that helps!
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