try ffpyplayer

katrain/__main__.py

@@ -3,7 +3,7 @@
 import os
 
 os.environ["KCFG_KIVY_LOG_LEVEL"] = os.environ.get("KCFG_KIVY_LOG_LEVEL", "warning")
-os.environ["KIVY_AUDIO"] = "sdl2"  # force working audio
+os.environ["KIVY_AUDIO"] = "ffpyplayer"  # force working audio
 
 # next, icon
 from katrain.core.utils import find_package_resource, PATHS

setup.py

@@ -41,12 +41,13 @@ setup(
         "wheel",
         "setuptools",
         "importlib_resources ;python_version<'3.7'",
-        "pygame",  # some versions need this for kivy
+        "pygame",  # some mac versions need this for kivy
         "cython>=0.24,<=0.29.14,!=0.27,!=0.27.2",  # kivy wants this
         "kivy_deps.glew;platform_system=='Windows'",
         "kivy_deps.sdl2;platform_system=='Windows'",
         "kivy_deps.gstreamer;platform_system=='Windows'",
-        "kivy>=2.0.0rc2",
+        "kivy==2.0.0rc2", # rc3 failing on mac
+        "ffpyplayer>=4.3.1",
         "kivymd>=0.104.1",
         "screeninfo;platform_system!='Darwin'",  # for screen resolution, has problems on macos
     ],