Not quite. Sometimes &quot;bestaudio&quot; downloads webm files because Opus audio tracks report higher average variable bitrate. If you don&#x27;t want to download video+audio and don&#x27;t want to transcode or deal with Opus stuff, you need that m4a flag in there. Since nothing supports Opus and you need to transcode and remove video, webm seems like a losing proposition. And higher bit rate is deceptive since AAC is a much better encoder even at a lower bit rate.