def _before_change_mpv_widget_parent(self):
"""
According to Qt docs, reparenting an OpenGLWidget will destory the GL context.
In mpv widget, it calls _mpv_opengl_cb_uninit_gl. After uninit_gl, mpv can't show
video anymore because video_out is destroyed.
See mpv mpv_opengl_cb_uninit_gl implementation for more details.
"""
_mpv_set_property_string(self._app.player._mpv.handle, b'vid', b'no')
def _after_change_mpv_widget_parent(self):
"""
To recover the video show, we should reinit gl and reinit video. gl is
automatically reinited when the mpv_widget do painting. We should
manually reinit video.
NOTE(cosven): After some investigation, I found that the API in mpv to
reinit video_out(maybe video is almost same as video_out)
is init_best_video_out. Theoretically, sending 'video-reload' command
will trigger this API. However, we can't run this command
in our case and I don't know why. Another way to trigger
the API is to switch track. Changing vid property just switch the track.
Inpect mpv init_best_video_out caller for more details. You should see
mp_switch_track_n is one of the entrypoint.
"""
_mpv_set_property_string(self._app.player._mpv.handle, b'vid', b'1')
