Minor Issues with Session query

While writing olaris-react!104 (merged), some minor issues popped up with the query.

1. Audio as mp4a is showing as a video/mp4 container
2. Sessions take forever to be removed from the current sessions - was told this is because every 20 minutes they are cleaned up? I'm not sure of the solution code-wise but this query should be fairly instantaneous. Eg if someone has stopped the playback the query should fairly quickly either no longer return it, or return some state to the client so they know it's actually stopped and to hide it.
3. There is something wrong with the resolution when you're transcoding to a lower quality