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Old 5th December 2018
Audio Alchemist
Lagerfeldt's Avatar
Option A is the only real choice.

YouTube will always encode your audio.

This potentially leads to transcoding (=double encoding) if your audio is already lossy encoded, regardless of how closely you match YouTube's own settings in your uploaded video.

AFAIK YouTube still uses a variety of audio codecs for different platforms, including AAC, Opus, Vorbis, and even MP3. Anything you give YouTube will be chewed up and spat out in these formats depending on what platform is used to play the video.