I tried all the different audio formats and only the MP3 version seems to load and playback. The other formats say there was an error loading, but then the error message area is blank afterwards where I would think it would explain why.
Doing a little bit of reading, maybe Windows has a different set of audio formats it supports. https://forum.qt.io/topic/57675/which-file-formats-or-codecs-does-qmediaplayer-support Which this article says the Windows version supports DirectShow...which are these options... https://msdn.microsoft.com/en-us/library/windows/desktop/dd407173%28v=vs.85%29.aspx
If it is using DirectShow, then the formats supported depend on what DirectShow filters are available on the system. There are a lot of third-party DirectShow filters to support different formats and codecs, and it's up to users to install the filters they want to use. When it comes to DirectShow filters, I can think of ffdshow, perhaps you can give it a try?
we currently give a list of audio formats that Krita can import. The goal of this ticket might just be to update our documentation on what audio formats are supported on different operating systems. See this page https://docs.krita.org/Audio_for_Animation
If installing DirectShow filters does get Krita to support more format, we might as well add that to the docs. I haven't tried it though.
Looks like Qt provides a handy function to query for support by mime-type and codecs: QMediaPlayer::hasSupport. However, the results it gives do not seem to match with actual support. For example, here it reports wav as not supported, while playing them without a problem.
We'll look at the range of supported formats once audio is working more consistently across platforms.