Ambient broadcasts (also called continuous broadcasts) are a special kind of live stream that: 

• Can exceed Facebook’s four hour time limit.
Will disappear from your timeline immediately when the stream ends.
• Does not send notifications to followers.

According to Facebook, this kind of stream is ideal for live feeds of aquariums, museums, and zoos.

Turn Ambient mode on in the Facebook section of Ecamm Live's Preferences.

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