Comments

Marco. wrote on 4/26/2021, 11:17 AM

What's the problem with MP4 as container for the AAC audio stream?

rraud wrote on 4/26/2021, 11:29 AM

Most MP4 files (with or without video) use the AAC audio codec as does M4A audio files. <.m4a > is a more common extension for audio only (AAC) files (especially in the Mac camp). Either way, they use the AAC codec. You can change the file extension to <.aac> if you absolutely need it.

Bob-Hale wrote on 4/26/2021, 11:57 AM

Ok, I don't usually work with video, as I have done only location audio recording for years. A client asked me to tweak the audio from a live stream concert which is to be uploaded to YouTube, and I found information that they require AAC format audio. It sounds like the mp4 should work fine for this purpose. Thank you for helping me understand unfamiliar technicalities.

Bob-Hale wrote on 4/26/2021, 12:01 PM

rraud,

I work in the Microsoft camp. If I understand your reply to my post, the mp4 extension can be changed to aac. Right? Thanks for your help.

rraud wrote on 4/27/2021, 10:56 AM

Use the MP4 <.mp4> extension for YouTube uploads... however.. YT does not support audio-only files. Loop a still photo or title graphic for a video track.
Otherwise you could use a (audio-only) music streaming site like Spotify, TIDAL, iTunes, Amazon Music, Pandora or Deezer.
In any of the above, including YT, the file's integrated loudness should be around -14 LUFS (not be confused with dBFS).