Fix VideoFrame.pts typing in tests

Fixes 8485992

Author: velsinki

tests/test_seek.py

@@ -104,6 +104,8 @@ def test_decode_half(self) -> None:
         frame_count = 0
 
         for frame in container.decode(video_stream):
+            assert frame.pts is not None
+
             if current_frame is None:
                 current_frame = timestamp_to_frame(frame.pts, video_stream)
             else:

tests/test_videoframe.py

@@ -32,7 +32,9 @@ def test_frame_duration_matches_packet() -> None:
         packet_durations.sort(key=lambda x: x[0])
 
     with av.open(fate_suite("h264/interlaced_crop.mp4")) as container:
-        frame_durations = [(f.pts, f.duration) for f in container.decode(video=0)]
+        frame_durations = [
+            (f.pts, f.duration) for f in container.decode(video=0) if f.pts is not None
+        ]
         frame_durations.sort(key=lambda x: x[0])
 
     assert len(packet_durations) == len(frame_durations)