I have a disk with a lot of ■■■■. It would be nice to have a utility to check if the media files are compatible with the WDTV media players and report back which of them are not compatible, problem with video and/or audio codecs.
Since many downloads are poor encodes, and won’t play properly despite being supported codecs in supported containers, simply because they’re bad files, even if such a program did exist you’d probably find some files that it says will play, that won’t play.
The only sure-fire way, that works 100% of the time, is to make the video files yourself with a proper encoder. Then they all play back.