This is how to fix your Radeon Relive Audio Out of Sync.
This is if you have visited this AMD FORUM and your problem isn't fixed yet.
In the Picture attached that encircled tab is you needed. STEPS:
You need to know if your Audio is delayed or advanced to the video you have recorded.
If your audio is delay you need to do is lower the Audio Bitrate of the settings on the Radeon Relive (repeat this step until your Audio is okay). Then skip step 3.
If your audio is advance you need to do is Higher the Audio Bitrate of the settings on the Radeon Relive (repeat this step until your Audio is okay).