Actually mpv could use youtube-dl internally to download video. Some examples with the same video, but different resolution and framerate:
Code:
#720p@30fps
mpv --ytdl-raw-options=format=22 ytdl://https://www.youtube.com/watch?v=6_W2w0oBwb8
#720p@60fps
mpv --ytdl-raw-options=format=298+140 ytdl://https://www.youtube.com/watch?v=6_W2w0oBwb8
#1080p@60fps
mpv --ytdl-raw-options=format=299+140 ytdl://https://www.youtube.com/watch?v=6_W2w0oBwb8