(sierra, mpv-legacy) no audio during playback, [vo/gpu] opengl cocoa backend is deprecated, use vo=libmpv instead

[mrkapqa]

Hello,

installed mpv-legacy on Mac OS X Sierra 10.12.6 and issue is

with playback since there is no audio coming out.

like

mpv https://www.youtube.com/watch?v=OYxQ4Lvqn14
 (+) Video --vid=1 (*) (vp9 3840x2160 59.940fps)
 (+) Audio --aid=1 --alang=eng (*) (opus 2ch 48000Hz)
     Subs  --sid=1 --slang=live_chat 'json' (null) (external)
File tags:
 Uploader: Dave's Garage
 Channel_URL: https://www.youtube.com/channel/UCNzszbnvQeFzObW0ghk0Ckw
''[vo/gpu] opengl cocoa backend is deprecated, use vo=libmpv instead''
Could not open/initialize audio device -> no sound.
Audio: no audio
VO: [gpu] 3840x2160 yuv420p
V: 00:00:02 / 00:14:14 (0%) Dropped: 45 Cache: 2.8s/4MB

Exiting... (Quit)

when i insert "vo=libmpv" into mpv.conf, there comes another error,

 mpv https://www.youtube.com/watch?v=OYxQ4Lvqn14
 (+) Video --vid=1 (*) (vp9 3840x2160 59.940fps)
 (+) Audio --aid=1 --alang=eng (*) (opus 2ch 48000Hz)
     Subs  --sid=1 --slang=live_chat 'json' (null) (external)
File tags:
 Uploader: Dave's Garage
 Channel_URL: https://www.youtube.com/channel/UCNzszbnvQeFzObW0ghk0Ckw
[vo/libmpv] No render context set.
Error opening/initializing the selected video_out (--vo) device.
Video: no video

Exiting... (Errors when loading file)

thank you very much