Index: anki/mpv.py
--- anki/mpv.py.orig
+++ anki/mpv.py
@@ -104,7 +104,7 @@ class MPVBase:
         """
         self.argv = [self.executable]
         self.argv += self.default_argv
-        self.argv += ["--input-ipc-server", self._sock_filename]
+        self.argv += ["--input-ipc-server=" + self._sock_filename]
         if self.window_id is not None:
             self.argv += ["--wid", str(self.window_id)]
 
