For me, the sync is fine at the start of playback on PrimeVideo. It just becomes bad progressively (which leads me to believe they have used a video framerate t

For me, the sync is fine at the start of playback on PrimeVideo. It just becomes bad progressively (which leads me to believe they have used a video framerate that is ever so slightly different from the source and have keyframes insertion after a longer than optimal duration; similarly sample rate mismatch for output audio relative to input audio stream could be a potential cause). And I use a FireStick, FWIW. BTW, their own trascoder product MediaConvert seems to have this issue (It is possible that it could be user error too in how they have used the product or setup the parameters). [1] My guess is PrimeVideo dogfoods MediaConvert and they also have this issue. They could have fixed it for newer content, but previously transcoded content still has issues (which will remain until they are re-transcoded). [1]: https://repost.aws/questions/QUGajgu4zKTlewlTg1M96i_Q/questions/QUGajgu4zKTlewlTg1M96i_Q/mediaconvert-introduces-audio-video-sync-issue https://repost.aws/questions/QUGajgu4zKTlewlTg1M96i_Q/questi...?