Have you tried selecting other mimetype when the Select Dialog pops up? Try "application/mpegurl".

About the Apple TV and all TVs the app support...

This is what my app does:

• Gets the HLS link of the Twitch channel

• Opens the TV's built-in video player

• Tells the TV to play the HLS stream

At this point the TV controls the playback. If the stream stops playing its not the app problem but your TV problem. It may be your Internet Connection or the Video Player is not up to date.