So this has been happening completely randomly with both Instant Replay and GVR. I'll record a video or save a replay, but for some reason, some videos do not have video for the entire recording. It will record ~30 seconds, or a minute or two, but then the rest of the video is just audio. I've tried playing the files in multiple media players and it's the same problem. Unfortunately it never fails that the videos I want the most are the ones that have issues.
Windows 7 Home Premium 64-bit
i7-3820 @ 3.6GHz
Radeon HD 7950 3GB
I created a ticket for this issue so that we can continue working on it there. Ticket #5117