iOS 14: copying videos from the Photos app using AVAssetExportSession resulting in audio getting out of sync

Media Technologies Video
miamitwinz OP
Created Dec ’20
Replies 7
Boosts 0
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Participants 3
iOS 14: copying videos from the Photos app using AVAssetExportSession resulting in audio getting out of sync. The audio track start time is off by ~0.09 sec. On iOS 13, while there is a lag, it's only ~0.04 sec, which is virtually unnoticeable. Is anyone else experiencing this issue and is there a solution?
Answered by Media Engineer in 669877022
It appears that the issue should be fixed in an upcoming software update.
Replies  7
Boosts  0
Views  1.3k
Participants  3
Media Engineer OP
Apple
Dec ’20
Please file a bug report using the feedback assistant. We would not expect the audio and video to be out of sync on any iOS release, and certainly would not expect the problem to get worse from release to release. Please include at least an example of a source file with which you see the problem, and ideally include a sample app we can build & run to reproduce the issue.
1
miamitwinz OP
Feb ’21
Hi there, Thanks for your response. We've already filed a bug report on 11/13/2020 titled "iOS 14: copying videos using AVExportSession resulting in audio getting out of sync". We'll add a sample app and media file.
0
iosnicholas OP
Apr ’21
I found that it was actually using the AVComposition that was causing the syncing issues. When inspecting the individual audio and video tracks, I saw consistently that the audio track was shorter than the video track, creating a "blip" or offset syncing issue at the loop boundary of the video. Would love to know if there was ever any resolution on this!
0
miamitwinz OP
Apr ’21
We filed a bug report, but haven't heard back.
0
Media Engineer OP
Apple
Apr ’21
Accepted Answer
It appears that the issue should be fixed in an upcoming software update.
1
miamitwinz OP
Apr ’21
Oh great! Fingers crossed!
0
miamitwinz OP
Apr ’21
I'm happy to report that the issue seems to have been fixed in iOS 14.5 beta 7!
0
iOS 14: copying videos from the Photos app using AVAssetExportSession resulting in audio getting out of sync
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