The Apple TV app, linking it, sending a film to a TV, and TV sound sync
Camcorder for Apple TV
The Apple TV app shows your uploads and the channels you follow, with the same four sections as the phone's feed. Open a film and it plays with its music.
Linking your TV
A TV shows a code. Scan it with your phone's camera, and on the card Show your channels on this TV?, tap Show. Whoever is watching that TV will see your channels, and it stays up to date.
A TV signed in to the same Apple Account finds your channels without a code.
The list of who you follow is stored sealed, so the host cannot read it. A linked TV can read it and change nothing.
Profiles
Several people can link one TV. Tap the name at the top left of the TV's home to switch, take someone off, or Add Profile. A PIN channel asks once on the TV, with Enter the PIN.
Sending your film to a TV
Turn on Screen Mirroring to a TV from Control Center. Open a film on your phone: the film fills the TV's height, and the phone keeps every control. Its screen says Tap or scrub for controls. The camera's picture never goes to the TV. Between films the TV says Choose a film on your phone.
TV sound sync
Some TVs delay their sound by themselves, so lips and voices come apart. On those TVs the app offers Calibrate sound.
Hold your phone up facing the TV, like taking a photo of it, and make sure the TV's volume is up. It watches for a flash and listens for a beep. The app then holds the picture back to meet the sound.
Use − and + to fine-tune it while the film plays, until the lips match the voices. Auto calibrate measures again. The setting is kept for that TV. While a command travels to a delayed TV, the phone shows a ring and waits.
An Apple TV does not need this.
The Camcorder manual. This page as Markdown