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Fixes for using FFmpeg 6.1 due to deprecations. Uses `#if` macros to allow builds for using older versions of FFmpeg. AVFrame.key_frame was replaced with a flag in AVFrame.flags. The commit adding the flag is [1] in FFmpeg's repository, and the deprecation is in commit [2]. In summary of the "key_frame" change, AVFrame.key_frame is deprecated, and AVFrame.flags indicates with a bit flag if it is a key frame (with the enum/defined AV_FRAME_FLAG_KEY). [1]: avutil/frame: add a keyframe flag to AVFramecc11191fda[2]: avutil/frame: deprecate key_frame3e06f6f040