Add compatibility with FFmpeg 8.0 #9245
                
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key_frame was deprecated in 2023 (FFmpeg 6.1):
2023-05-04 - 0fc9c1f6828 - lavu 58.7.100 - frame.h
Deprecate AVFrame.interlaced_frame, AVFrame.top_field_first, and
AVFrame.key_frame.
Add AV_FRAME_FLAG_INTERLACED, AV_FRAME_FLAG_TOP_FIELD_FIRST, and
AV_FRAME_FLAG_KEY flags as replacement.