just a though but could the missing 8 minutes be due to compression factors? I find it hard to believe with the advancements in surveillance tech the video quality would be that bad in the fed.
This is better footage and shot from a cell phone
https://www.youtube.com/watch?v=XkIhI-xVm2Q

Idaho prisons have better cameras
https://www.youtube.com/watch?v=XkIhI-xVm2Q