Move key_frame attribute to Frame class

av/frame.pyi

@@ -9,10 +9,13 @@ class SideData(TypedDict, total=False):
 class Frame:
     dts: int | None
     pts: int | None
-    time: float | None
     time_base: Fraction
-    is_corrupt: bool
     side_data: SideData
     opaque: object
-
+    @property
+    def time(self) -> float | None: ...
+    @property
+    def is_corrupt(self) -> bool: ...
+    @property
+    def key_frame(self) -> bool: ...
     def make_writable(self) -> None: ...

av/frame.pyx

@@ -132,6 +132,16 @@ cdef class Frame:
         """
         return self.ptr.decode_error_flags != 0 or bool(self.ptr.flags & lib.AV_FRAME_FLAG_CORRUPT)
 
+    @property
+    def key_frame(self):
+        """Is this frame a key frame?
+
+        Wraps :ffmpeg:`AVFrame.key_frame`.
+
+        """
+        return bool(self.ptr.key_frame)
+
+
     @property
     def side_data(self):
         if self._side_data is None:

av/video/frame.pyi

@@ -32,7 +32,6 @@ class VideoFrame(Frame):
     planes: tuple[VideoPlane, ...]
     width: int
     height: int
-    key_frame: bool
     interlaced_frame: bool
     pict_type: int
     colorspace: int

av/video/frame.pyx

@@ -170,23 +170,11 @@ cdef class VideoFrame(Frame):
         """Width of the image, in pixels."""
         return self.ptr.width
 
-
     @property
     def height(self):
         """Height of the image, in pixels."""
         return self.ptr.height
 
-
-    @property
-    def key_frame(self):
-        """Is this frame a key frame?
-
-        Wraps :ffmpeg:`AVFrame.key_frame`.
-
-        """
-        return self.ptr.key_frame
-
-
     @property
     def interlaced_frame(self):
         """Is this frame an interlaced or progressive?
@@ -196,7 +184,6 @@ cdef class VideoFrame(Frame):
         """
         return self.ptr.interlaced_frame
 
-
     @property
     def pict_type(self):
         """One of :class:`.PictureType`.