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We have ffmpeg-based code that runs on both iOS and Macos. We've noticed, that with the upgrade from iOS 14 -> iOS 15 videotoolbox decoder started failing to process h264 stream. Today we've finally dug a bit deeper into this, and it seems the failure is similar on iOS 15, and on MacOS 12.3 -- but only on Apply Silicon for the latter. The same software and input work fine on Intel Mac. The failure is explained in some detail here: https://trac.ffmpeg.org/ticket/9713 and here: https://trac.ffmpeg.org/ticket/9016 It is quite easily reproduced with ffmpeg