Chromecast (casting)
Chromecast (casting) is Google's technology for sending a video from a phone, tablet or browser to a TV, where the TV device fetches and plays the stream itself. The phone acts as a remote control, so battery use stays low. Casting works with Chromecast devices, Google TV and many smart TVs with Google Cast built in.
Why it matters
Many viewers prefer watching long-form video on the TV. Supporting casting lets a mobile or web app reach the big screen without building separate TV apps for every platform, which raises watch time and perceived quality at relatively low cost.
How it works
- The sender app on a phone or browser discovers Cast devices on the same network.
- The viewer picks a TV, and the app launches a receiver app on the Cast device.
- The receiver fetches the stream directly from the internet, not from the phone.
- The phone becomes a remote control for play, pause, seek and volume.
Chromecast vs AirPlay: what is the difference?
Chromecast uses Google Cast and works across Android, iPhone and Chrome, while AirPlay is Apple's protocol for Apple devices and AirPlay-compatible TVs. With Cast, the TV usually fetches the stream itself. AirPlay can do the same for supported video or mirror the screen. Many apps support both to reach every viewer.
Does Chromecast support DRM?
Yes, Chromecast supports Widevine and PlayReady DRM in the receiver app. The app must pass license details to the receiver so it can request keys itself. FairPlay content made for Apple devices will not play on Chromecast, so services typically package content for multiple DRM systems.
Where it's used
OTT services, live sports streamers and fitness apps add Chromecast support so viewers can move videos from phone or laptop to the TV with one tap.
By the numbers
- The first-generation Chromecast launched on July 24, 2013, and casting uses the Google Cast protocol. (Chromecast, Wikipedia)
