Casting vs. screen mirroring: which one fits your files?

Marketing uses "casting" and "mirroring" interchangeably, which is a shame, because they solve different problems. If you've ever mirrored your phone to a TV to watch a home video and wondered why it looked soft, stuttered, and announced your group chats to the room, you've seen the difference firsthand.

Mirroring: a live copy of your screen

The phone renders everything as usual, captures the result, compresses it in real time, and ships it to the TV. The TV displays a live picture of your screen. Whatever happens on the phone happens on the big display a moment later.

That generality is the selling point and the cost. It works with anything on screen, but you pay for it: capture pipelines often downscale to keep up, latency creeps in, the phone burns battery encoding video at the same time as playing it, and every notification joins the show. The phone also has to stay awake and engaged the whole time.

Casting an app or a tab

The Chromecast-style flow hands content to the TV itself. Your phone stops being the renderer and becomes the remote: the TV loads and plays the stream on its own hardware. Quality is whatever the service delivers, and it works beautifully, for services that support it. The requirement is that the TV (or a dongle) can reach the content itself, which usually means cloud content.

Casting a file

The third option gets least attention because there's no big platform behind it: send the file itself to the screen and let that device play it locally. Your phone holds the file and drives the controls. Nothing else on your phone reaches the TV.

This is what Chusko does. The projector streams raw bytes straight to the screen over an encrypted peer-to-peer connection; the screen decodes them with its own engine and plays at original quality. Playback controls run from your phone. And since the bytes go device-to-device, no upload sits between them.

Which one when

• Streaming apps: use the app on the TV directly, or app casting. Mirroring adds nothing here.
• Anything on screen that isn't a file (a game, a video call, a web page): mirroring's territory.
• A video file you own: file casting. Original quality, full controls, private by default.

Most people mirror their videos because it's the only button in front of them. Once you know the file-casting route exists, it wins for anything stored locally. Compare it with the other common route in Chusko vs. cloud casting services, or see it applied to TVs in casting from your phone to an Android TV. Short answers live in the FAQ.