Do you have tunneled playback or RTS turned on in the configuration menu?
And Backup Player is libvlc, so it going back to the home screen means the player is crashing on that stream.
And the stream format feature, is just there to show what the server offers
Its default to Auto
Most servers only offer TS or HLS
Auto plays HLS first and if that doesn't work it uses TS
We can't add more, as every provider offers it themselves, and it doesn't work the way you think it does
Some servers offer RTMP, but its rare.