AAC Receiver

I have a WD TV Live Hub with audio set to pass-thru HDMI to a Yamaha a/v receiver.  My mp4 videos with multichannel AAC audio is played as 2 channel.  From what I’ve read, it’s more than likely due to my receiver not supporting AAC.

I’ve been researching the latest receivers, but I haven’t seen any that state they specifically support AAC.  How do I know if a receiver supports it?  How do I know my current one doesn’t, for that matter?

Thanks

The user manual of your receiver, if not, then contact the tech support of your device and ask how you can find out.