How to format only youtube videos

[apolo18]

Hi; I use smplayer +mpv and youtube dl for watch videos online i created a big list of movies and series from diferent videoservers like youtube, vk ,openload etc.To watch youtube videos in 480p i must put this in preferences-advanced-mplayer/mpv:--ytdl-format=bestvideo[height<=?720]+171, It works fine,but when i want to play a video from other server like openload an error occurs:[ytdl_hook] ERROR: requested format not available
[ytdl_hook] youtube-dl failed, trying to play URL directly.
So i want to know if there any way to play all videosevers keeping youtube format?

[PlayerMan]

Why you need a youtube format? Is it not better to download from youtube?