is AAC audio codec compatible with Apple IOS?

[tom11011]

I tried plex but couldn't get it to work with my firestick but it worked ok on my iphone.

I have the opposite issue with jellyfin.  I am thrilled it works with my firestick but the audio doesn't work on my iphone!  

Anyway, the audio codec I used is AAC when using ffmpeg to create my mp4 files.  Any suggestions?  Thank you.

[TheDreadPirate]

Which client are you using on iOS? Jellyfin Mobile? If so, give Swiftfin a try.