OT Question on audio downloads from youtube

Roger Bell_West roger at firedrake.org
Wed Sep 23 04:55:55 EDT 2020

On Wed, Sep 23, 2020 at 12:16:10AM +0100, budge wrote:
>I have now found that minimserver, which runs in the NAS and serves the music
>data to my LAN and thence to my renderers, is not supported by .opus.  I can
>use AAC files so will download them to .aac or  should that be .m4a.  No
>hardship and glad I found out now.

It can be both. aac is an encoding format; m4a is a container format.
For example if I ffprobe the latest Brain of Britain (obtained via
GIP) I get:

Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 320 kb/s (default)

This is an AAC-encoded stream in an m4a container.

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