Fix #2161 null check for get_media_type_str

Author: WyattBlue

av/codec/codec.py

@@ -172,7 +172,8 @@ def type(self):
         E.g: ``'audio'``, ``'video'``, ``'subtitle'``.
 
         """
-        return lib.av_get_media_type_string(self.ptr.type)
+        media_type = lib.av_get_media_type_string(self.ptr.type)
+        return "unknown" if media_type == cython.NULL else media_type
 
     @property
     def id(self):

av/codec/codec.pyi

@@ -61,7 +61,9 @@ class Codec:
     @property
     def long_name(self) -> str: ...
     @property
-    def type(self) -> Literal["video", "audio", "data", "subtitle", "attachment"]: ...
+    def type(
+        self,
+    ) -> Literal["video", "audio", "data", "subtitle", "attachment", "unknown"]: ...
     @property
     def id(self) -> int: ...
     frame_rates: list[Fraction] | None

av/stream.py

@@ -275,7 +275,8 @@ def type(self):
 
         :type: Literal["audio", "video", "subtitle", "data", "attachment"]
         """
-        return lib.av_get_media_type_string(self.ptr.codecpar.codec_type)
+        media_type = lib.av_get_media_type_string(self.ptr.codecpar.codec_type)
+        return "unknown" if media_type == cython.NULL else media_type
 
 
 @cython.cclass

av/stream.pyi

@@ -48,7 +48,7 @@ class Stream:
     disposition: Disposition
     frames: int
     language: str | None
-    type: Literal["video", "audio", "data", "subtitle", "attachment"]
+    type: Literal["video", "audio", "data", "subtitle", "attachment", "unknown"]
 
     # From context
     codec_tag: str