Though it’s impossible to be certain without actually seeing Apple’s source code, this is very likely to be an off-by-one bug. With the tvOS 11.3 update, this mute special case is now kicking in at -145 dB, instead of -144 dB. The receiver then knows it should not play any audio at all. When audio should be fully muted, a sender tells the receiver to set volume to -144 dB. However, a -30 dB reduction is often not enough to mute very loud audio, so there’s also a special value to force full muting. That volume command allows a value range of 0 dB for full volume down to -30 dB for full reduction. As a result, adjusting the volume slider in iTunes immediately changes the remote volume, with no lag. To do this, the sender (here, iTunes) provides the volume level using a special SET_PARAMETER volume command. To eliminate slider latency, AirPlay audio has its volume set on the receiving end (here, that’s the Apple TV). The sending volume in iTunes is at 0, but audio will still be heard.Ī little background on AirPlay volume control helps explain what’s occurring. This issue occurs with any source sending to the device, including Apple’s iTunes and iOS, as well as previous versions of our own Airfoil. Send audio to an Apple TV running tvOS 11.3, and you’ll still hear audio leaking out of the AppleTV. You can try it yourself by setting the iTunes volume slider to the far left, as seen below. When the sender has its volume set to zero, audio will still be heard from the Apple TV. In short, for Apple TV receiving audio via AirPlay, volume handling is broken on tvOS 11.3. This bug is likely to affect not just Airfoil users, but anyone who sends AirPlay audio to their Apple TV, so a summary of Apple’s bug may be helpful. The just-released version 5.7.3 works around a bug introduced by Apple in tvOS 11.3. Posted By Quentin Carnicelli on April 3rd, 2018Įarlier today, we shipped an update to our home audio streamer Airfoil for Mac.
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