On iOS26, in our video playback app(use AVPlayer), the sound and video are out of sync when playing after seeking.

Media Technologies Video
t.nishiyama OP
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Our app plays TS files on an iPhone.

The app fragments the TS files, creates an M3U8 playlist, converts them to HLS(HTTP Live Streaming), and then uses AVPlayer to play the video content.

On a device running iOS 26, after starting playback and seeking, restarting playback causes the video and audio to be out of sync (by about 2-3 seconds depending on the situation). This also occurs on iPadOS/macOS 26.

This issue was not observed prior to iOS 18.

We are trying to fix this issue on the app side, but we have the following questions:

  1. The behavior of AVPlayer is different between iOS 26 and previous versions. Has there been any change that could be considered? Or is it a bug?

  2. We tried pausing before seeking, but it didn’t seem to have any effect. Are there any APIs or workarounds that can improve this?

  3. We would appreciate it if you could tell us any other helpful documents or URLs.

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On iOS26, in our video playback app(use AVPlayer), the sound and video are out of sync when playing after seeking.
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