Please use these bbcode rules, in your body:
The words MUST BE lowercase.

Embed Youtube Video in post using bbcode
[youtube*]xxxxxxx[*/youtube] where xxxxxxxx is the video ID

Embed Vimeo Video in post using bbcode
[*vimeo]xxxxxxx[*/vimeo] where xxxxxxxx is the video ID

Embed SoundCloud Track in post using bbcode
[*soundcloud]track_url[*/soundcloud]

* use without the *