Just because it plays on a computer doesn’t mean a thing – you can have downloaded a hundred different codecs the Live (which is a hardware player that has to have all codecs in firmware) may not have. No hardware player out there supports all containers and codecs.
However, AC3 audio should work – can you post the MediaInfo on the file that’s not playing? And how did you create this file in the first place?
I’m not going to post a link. I want you to do this – bring up Google (I’m pretty sure you know how to get that up) and type in the word “MediaInfo”. Go to the first site listed (you can even use the “I’m feeling lucky” button). Presto!
I am going to get a avi convertor program. Some on the web have many different formats to convert to. Which is the preferred format to convert to? MKV MP4 MPEG?
Which seems to be the most agreeable and carry over the best quality with the WD Media Player?
Note that you can convert to MKV using MKVMerge (but use version 4.0 or earlier – later versions have issues). That may be all you need do (it’s quick and results in no loss of quality).
If you need to re-encode nothing works better than Handbrake.