Hi.. It looks like you have resample turned on. On the video on the time line, right mouse button and select properties. Then Tick Disable Resample. Render again as see it is better.
Hi Wayne.. Yes of course. If there is audio then select the first piece of video media and then hold SHIFT down and select the last piece of video media so that only video media is selected..
If you select all ( CTRL + A ) and then select the EDIT option at the of the screen – EDIT then Switches and then Disable Resample, it will do them all….