How to fix "Your app preview contains unsupported or corrupted audio" error

App Store Connect rejects app preview videos that lack an audio track, even a silent one, with the confusing error "Your app preview contains unsupported or corrupted audio." This commonly happens with Xcode Simulator recordings (via xcrun simctl io booted recordVideo), screen recordings without microphone audio, or exports from design tools that never included audio. It can also occur when an audio track exists but isn't in the AAC or PCM stereo format at 48 kHz that Apple expects. The fix is to add a silent AAC stereo track at 48 kHz using an ffmpeg command that copies the video stream and adds a silent audio source, or re-encode just the audio track if one already exists in a bad format. Apple's own suggested workaround is importing into iMovie, adding silent audio, and re-exporting. The author also built a paid one-click Mac app, App Preview Converter, that automatically fixes audio, resolution, frame rate, duration, and codec requirements in a single export.

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