Make ErrorType a proper Enum

av/enum.pyi

@@ -24,9 +24,10 @@ class EnumType(type):
     ) -> int | None: ...
 
 class EnumItem:
-    name: str
-    value: int
-
+    @property
+    def name(self) -> str: ...
+    @property
+    def value(self) -> int: ...
     def __int__(self) -> int: ...
     def __hash__(self) -> int: ...
     def __reduce__(

av/error.pyi

@@ -1,4 +1,5 @@
 import builtins
+from enum import Enum
 
 from .enum import EnumItem
 
@@ -15,41 +16,43 @@ def err_check(res: int, filename: str | None = None) -> int: ...
 
 BUFFER_TOO_SMALL: EnumItem
 
-class ErrorType(EnumItem):
-    BSF_NOT_FOUND: int
-    BUG: int
-    BUFFER_TOO_SMALL: int
-    DECODER_NOT_FOUND: int
-    DEMUXER_NOT_FOUND: int
-    ENCODER_NOT_FOUND: int
-    EOF: int
-    EXIT: int
-    EXTERNAL: int
-    FILTER_NOT_FOUND: int
-    INVALIDDATA: int
-    MUXER_NOT_FOUND: int
-    OPTION_NOT_FOUND: int
-    PATCHWELCOME: int
-    PROTOCOL_NOT_FOUND: int
-    UNKNOWN: int
-    EXPERIMENTAL: int
-    INPUT_CHANGED: int
-    OUTPUT_CHANGED: int
-    HTTP_BAD_REQUEST: int
-    HTTP_UNAUTHORIZED: int
-    HTTP_FORBIDDEN: int
-    HTTP_NOT_FOUND: int
-    HTTP_OTHER_4XX: int
-    HTTP_SERVER_ERROR: int
-    PYAV_CALLBACK: int
+class ErrorType(EnumItem, Enum):
+    BSF_NOT_FOUND: EnumItem
+    BUG: EnumItem
+    BUFFER_TOO_SMALL: EnumItem
+    DECODER_NOT_FOUND: EnumItem
+    DEMUXER_NOT_FOUND: EnumItem
+    ENCODER_NOT_FOUND: EnumItem
+    EOF: EnumItem
+    EXIT: EnumItem
+    EXTERNAL: EnumItem
+    FILTER_NOT_FOUND: EnumItem
+    INVALIDDATA: EnumItem
+    MUXER_NOT_FOUND: EnumItem
+    OPTION_NOT_FOUND: EnumItem
+    PATCHWELCOME: EnumItem
+    PROTOCOL_NOT_FOUND: EnumItem
+    UNKNOWN: EnumItem
+    EXPERIMENTAL: EnumItem
+    INPUT_CHANGED: EnumItem
+    OUTPUT_CHANGED: EnumItem
+    HTTP_BAD_REQUEST: EnumItem
+    HTTP_UNAUTHORIZED: EnumItem
+    HTTP_FORBIDDEN: EnumItem
+    HTTP_NOT_FOUND: EnumItem
+    HTTP_OTHER_4XX: EnumItem
+    HTTP_SERVER_ERROR: EnumItem
+    PYAV_CALLBACK: EnumItem
 
-    tag: bytes
+    @property
+    def tag(self) -> bytes: ...
 
 class FFmpegError(Exception):
     errno: int
     strerror: str
     filename: str
     log: tuple[int, tuple[int, str, str] | None]
+    type: ErrorType
 
     def __init__(
         self,