swap avconv / ffmpeg. ffmpeg is obsolete, so it shouldn't be evaled first (crashes on my pc) (#364)
swap avconv / ffmpeg. ffmpeg is obsolete, so it shouldn't be evaled first (crashes on my pc) (#364)

Avconv seems more likely to work for more people, so switch
dianchen96/gym,dianchen96/gym,Farama-Foundation/Gymnasium,Farama-Foundation/Gymnasium