obs-ffmpeg: Do not use HW accel by default on mac

Due to crashes being caused by hardware acceleration in the media source
on mac, disable hardware acceleration of the media source being on by
default for the time being.

plugins/obs-ffmpeg/obs-ffmpeg-source.c

@@ -337,7 +337,7 @@ static void ffmpeg_source_defaults(obs_data_t *settings)
 	obs_data_set_default_bool(settings, "clear_on_media_end", true);
 	obs_data_set_default_bool(settings, "restart_on_activate", true);
 	obs_data_set_default_bool(settings, "force_scale", true);
-#if defined(_WIN32) || defined(__APPLE__)
+#if defined(_WIN32)
 	obs_data_set_default_bool(settings, "hw_decode", true);
 #endif
 }