Hello, everyone.

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I'm having a problem with a recording I made in QuickTime Player.

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I use BlackHole to capture the internal audio and an external microphone for my voice. Throughout the entire Zoom class, I could hear the audio perfectly, with no cuts or interruptions.

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The problem only occurs when I play back the recording. At the beginning of the video, everything sounds fine—both the teacher’s voice and my microphone. However, about halfway through the recording, the teacher’s voice (internal audio) starts to sound constantly choppy. This makes it impossible to watch the video I captured again; at least the first 30 minutes sound fine, but for the remaining 40 minutes, everything sounds choppy.

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Since I didn’t hear any cuts during the class, I suspect the problem occurred during the capture or recording and not in the Zoom stream—I honestly have no idea.

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Has anyone experienced something similar using QuickTime and BlackHole? Could it be due to a desynchronization in BlackHole, the MIDI audio settings, or a difference in sample rates between the devices?

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I appreciate any suggestions or experiences you can share.

Help me! This never used to happen to me before.