Add compatibility with FFmpeg 8.0

[rathann]

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.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9245

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[rathann]

Your CLA requires me to "grant to Meta and to recipients of software distributed by Meta a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Your Contributions and such derivative works." It does not require Meta to at least keep the code licensed under an open-source license which would acknowledge my authorship, so I'm not signing it.

I submit this under the same BSD 3-Clause License as this project. Feel free to take it under that condition.