Audio/Video Sync Issues in Video Clip
There is a known situation with some video editing software exported videos having sync issues. This happens due to a live broadcast dropping frames during internet fluctuations and some exported videos not being capable of handling variable frame rates.
To fix this issue convert the file using a program called HandBrake. It can be downloaded HERE for free.
When you open the software you'll be prompted to choose/open the video file.
Go to the Video tab in the center of the application and choose Constant Framerate. (See Image Below)
Handbrake will begin to convert the video into a new file. Depending on the length of the clip conversion can take a long time. Expect the conversion to last up to the duration of the clip.