Error: Audio is not two-channel stereo
App Store Connect rejection
Apple requires all App Store preview videos to have AAC stereo (2-channel) audio at a 48 kHz sample rate. If your video's audio track doesn't match these exact requirements, App Store Connect will reject the upload with this error. Even if the video looks perfect, a single audio mismatch is enough to block your submission.
Mono recording
Your screen recording captured audio from a single microphone, producing a 1-channel track instead of stereo.
Surround sound
The recording includes 5.1 or 7.1 surround audio channels, which Apple doesn’t accept for preview videos.
Missing audio track
The video has no audio stream at all, which App Store Connect treats as a spec violation.
Wrong sample rate
The audio sample rate is not 44.1 kHz or 48 kHz. Apple accepts both, but other rates are rejected.
You can fix the audio channel layout using FFmpeg from the command line:
ffmpeg -i input.mp4 -c:v copy -c:a aac -b:a 256k -ac 2 -ar 48000 output.mp4
This works, but you also need to verify the video codec, resolution, frame rate, and duration all match Apple's specs — one wrong parameter and App Store Connect rejects the upload.
LaunchSpec handles audio encoding automatically — upload your recording and get a file with AAC stereo 48 kHz, correct resolution, frame rate, and duration. Every spec, first try.
Upload your screen recording and get a compliant App Store preview video. No command line required.
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