I just upgraded and was playing a game that I record/instant replay often using ReLive. While in-game I used the SAVE INSTANT REPLAY hotkey and it saved a copy. When I opened the video it had no audio, other replays I have saved do not have this problem.
M5A97 LE R2.0
SAPPHIRE RX 580 4GB (STOCK SPEEDS)
19.1.1 - express install