I have a 96K 24 bit audio recording in Vegas 17.0 (Build 452) that I'm trying to render in AAC audio format, but the software only exports to a mp4 file when AAC Audio. Vegas AAC format does not show up as a choice. Any help is appreciated.
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.
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.
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).