Can't play AAC file from the music bought from iTunes

[BlackJack]

Hello @ALAN_WANG and welcome to the forum.

Please read the article below:

AAC Files Failing on Synology NAS DSM 7.1

Hi John, you need to download a static version of FFMPEG, put it in the folder “RoonServer/RoonOnNAS/bin” on your NAS and restart the RoonServer package. Link to FFMPEG (the same version as recommended for use with ROCK): https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz Unpack (maybe unpacking twice is needed) and copy only the ffmpeg-file into the above mentioned folder. Actually you will find a .txt file within the folder explaining the same thing. Hope this…

Did you install a suitable ffmpeg on your Roon Server installation on the NAS?