# 315  2160p[56]0  vp9
# 308  1440p[56]0  vp9
# 264  1440p       avc1
# 299  1080p[56]0  avc1
# 137  1080p       avc1

# -f 315+251/308+251/264+140/299+140/137+140/best
-f 308+251/264+140/299+140/137+140/best

--merge-output-format mkv
