Ogg audio is recognized as video format, and it is shown in video player.
Ogg can be a container for video content, so Obsidian doesn’t know. I know Ogg is commonly used as an audio format, but we really don’t want to assume that. Sorry about that.
I never seen OGG video 
Any additional attribute in link when we want to declare it is audio?
Probably there will be same problem for other formats.
Currently supported audio formats are: mp3, wav, m4a, 3gp, flac. Video formats are webm, mp4, and ogg. I don’t see a problem with the other audio formats as they cannot contain video, as far as I know.
Me either, but please see file type - Is .ogg for Audio or for Video format? - Ask Ubuntu. Maybe we can assume ogg is for audio and ogv is for video.