The video will try to load an HLS containing VP9-in-MP4 and fallback variants, with MP3 audio:
And with MP3 audio and only H.264 (marked as mp4a.40.34):
And with MP3-in-MP4 audio (marked as mp3):
And with MP3-in-MP4 audio (marked as mp4a.40.34):
And with MP3-in-TS audio: