ffmpeg -i INPUT -filter_complex "split[l][r];[l]stereo3d=sbsl:ml[left];[r]stereo3d=sbsl:mr" -map [left] -map 0:a -c:a copy left.mkv -map [right] -map 0:a -c:a copy right.mkv
[RIGHT]macOS 12.2.1 ,terminal .
video is right and left so correct command.
outputs "zsh: no matches found:"
maybe i...