diff --git a/av/frame.pyx b/av/frame.pyx
index 1084ca45e..57681bbcd 100644
--- a/av/frame.pyx
+++ b/av/frame.pyx
@@ -139,7 +139,7 @@ cdef class Frame:
         Wraps :ffmpeg:`AVFrame.key_frame`.
 
         """
-        return bool(self.ptr.key_frame)
+        return bool(self.ptr.flags & lib.AV_FRAME_FLAG_KEY)
 
 
     @property
diff --git a/av/video/frame.pyx b/av/video/frame.pyx
index bfc74c40a..e5cd523b5 100644
--- a/av/video/frame.pyx
+++ b/av/video/frame.pyx
@@ -177,12 +177,9 @@ cdef class VideoFrame(Frame):
 
     @property
     def interlaced_frame(self):
-        """Is this frame an interlaced or progressive?
+        """Is this frame an interlaced or progressive?"""
 
-        Wraps :ffmpeg:`AVFrame.interlaced_frame`.
-
-        """
-        return self.ptr.interlaced_frame
+        return bool(self.ptr.flags & lib.AV_FRAME_FLAG_INTERLACED)
 
     @property
     def pict_type(self):
diff --git a/include/libavcodec/avcodec.pxd b/include/libavcodec/avcodec.pxd
index 71121e976..d680e8b13 100644
--- a/include/libavcodec/avcodec.pxd
+++ b/include/libavcodec/avcodec.pxd
@@ -135,6 +135,9 @@ cdef extern from "libavcodec/avcodec.h" nogil:
 
     cdef enum:
         AV_FRAME_FLAG_CORRUPT
+        AV_FRAME_FLAG_KEY
+        AV_FRAME_FLAG_DISCARD
+        AV_FRAME_FLAG_INTERLACED
 
     cdef enum:
         FF_COMPLIANCE_VERY_STRICT
@@ -368,19 +371,16 @@ cdef extern from "libavcodec/avcodec.h" nogil:
         uint8_t **extended_data
 
         int format  # Should be AVPixelFormat or AVSampleFormat
-        int key_frame  # 0 or 1.
         AVPictureType pict_type
 
-        int interlaced_frame  # 0 or 1.
-
         int width
         int height
 
         int nb_side_data
         AVFrameSideData **side_data
 
-        int nb_samples  # Audio samples
-        int sample_rate  # Audio Sample rate
+        int nb_samples
+        int sample_rate
 
         AVChannelLayout ch_layout