Update AIRPLAY2.md

mikebrady · May 26, 2022 · 600ac26 · 600ac26
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Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/AIRPLAY2.md b/AIRPLAY2.md
@@ -21,7 +21,8 @@ AirPlay 2 support needs a slightly more powerful CPU for decoding and synchronis
 
 Here are some guidelines: 
 * Full access, including `root` privileges, to a system at least as powerful as a Raspberry Pi 2 or a Raspberry Pi Zero 2 W.
-* A fully up-to-date Linux. This is important, as some of the libraries must be the latest available.
+* A fully up-to-date Linux or FreeBSD. This is important, as some of the libraries must be the latest available.
+* A version of the ffmpeg library with an AAC decoder capable of decoding Floating Planar -- `fltp` -- material. There is a guide [here](https://github.com/mikebrady/shairport-sync/blob/development/TROUBLESHOOTING.md#aac-decoder-issues-airplay-2-only) to help you find out. (At the time of writing, Debian/Ubuntu/Raspberry Pi OS and FreeBSD all include this decoder. Fedora 36 does not.)
 * An audio output, for example an `alsa` device (or `sndio` in FreeBSD). You can use an application called [`sps-alsa-explore`](https://github.com/mikebrady/sps-alsa-explore) to test the suitability of hardware `alsa` audio devices on your device. Other backends continue to work as with "classic" Shairport Sync.
 
 Guides
@@ -33,7 +34,7 @@ AirPlay 2 -- More About What Works
 ---
 * Two types of audio are received by Shairport Sync -- "Realtime" streams of CD quality ALAC (like AirPlay 1) and "Buffered Audio" streams of AAC stereo at 44,100 frames per second. The selection of stream type is made by the player.
 * Audio is synchronised with other AirPlay 2 devices, including AirPlay 2 devices that have their own master clocks.
-* Shairport Sync continues to support AirPlay 1, and offers an AirPlay 1 compatibility mode for situations where iTunes on macOS or macOS Music plays to multiple speakers and one of more of them is compatible with AirPlay 1 only.
+* Shairport Sync offers AirPlay 1 compatibility for situations where iTunes on macOS or macOS Music plays to multiple speakers and where one of more of them is compatible with AirPlay 1 only.
 
 Note
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