Video testing fails in dry run and transcode

[nathanaeljames]

I have installed this on multiple machines, WSL on Windows and MacOS. When doing a transcode or even a dry run, convert-videos-for-plex will successfully identify and skip videos which it has already transcoded, returning Skipping (video format AVC Main@L4 will already play in Plex) UNTIL it comes to the first video in the directory which requires transcoding, after which point it will return false positives for everything in the directory and if -r is used it will transcode the video again despite it already being in the proper format. This makes it impossible to use this tool to do periodic checks of the entire library to eliminate one-off videos in the wrong format.