yt-dlp PR: yt-dlp/yt-dlp#13515

Current SABR downloader branch of yt-dlp can be found here: https://github.com/coletdjnz/yt-dlp-dev/tree/feat/youtube/sabr

It is still in development however if you'd like to test or are just interested, you can run with:
--extractor-args "youtube:formats=duplicate" -f "ba[protocol=sabr]+bv[protocol=sabr]"

Core SABR Implementation: https://github.com/coletdjnz/yt-dlp-dev/blob/feat/youtube/sabr/yt_dlp/extractor/youtube/_streaming/sabr/stream.py