What bitrate i should use for 7.1ch file?

[davidcameron]

I want to compress a audio from bluray and i don't know the quality setting for 7.1 channels. what bitrate is the most used for this type of audio?

[KarMa]

480kbit for AAC-LC is a good place to start.

[hello_hello]

For AAC you can use variable bitrate encoding and select a quality instead, so it works much like selecting a CRF value for x264 rather than a bitrate. What's your desired output format, because obviously the type of encoder used will make a difference. Without knowing that it's a bit like asking what bitrate to use to compress video without knowing the encoder type.

If you are wanting AAC for the output, you might want to read this
https://forum.videohelp.com/threads/377639-7-1ch-AAC-encoding#post2438694
but the bottom line is for 7.1ch AAC encoding, you probably should use QAAC.