Modified from upstream commit:
https://github.com/ankitects/anki/commit/ccd715013609133c55e83924734efa78abc03326
Fixes mpv argument syntax (support for old syntax removed in mpv 0.31):
https://anki.tenderapp.com/discussions/ankidesktop/38186-mpvprocesserror-unable-to-start-process
Necessary because we are currently unable to upgrade anki to the
latest version in guix (NPM dependencies currently unpackaged).
---
 anki/mpv.py   | 4 ++--
 anki/sound.py | 1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/anki/mpv.py b/anki/mpv.py
index f53d9d0..563fddc 100644
--- a/anki/mpv.py
+++ b/anki/mpv.py
@@ -104,9 +104,9 @@ 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)]
+            self.argv += ["--wid="+str(self.window_id)]
 
     def _start_process(self):
         """Start the mpv process.
diff --git a/anki/sound.py b/anki/sound.py
index aa3431b..a5fce44 100644
--- a/anki/sound.py
+++ b/anki/sound.py
@@ -124,7 +124,6 @@ class MpvManager(MPV):
 def setMpvConfigBase(base):
     mpvConfPath = os.path.join(base, "mpv.conf")
     MpvManager.default_argv += [
-        "--no-config",
         "--include="+mpvConfPath,
     ]
 
-- 
2.25.1