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Test av_video_hint_alloc with 0, 1, and 4 rects, and av_video_hint_create_side_data. Verifies that av_video_hint_rects and av_video_hint_get_rect return pointers consistent with rect_offset and rect_size, write/read-back of rect coordinates, both hint type values, and OOM paths via av_max_alloc. Coverage for libavutil/video_hint.c: 0.00% -> 82.05% The remaining uncovered lines are the nb_rects overflow guard and the av_buffer_create / av_frame_new_side_data_from_buf failure cleanup paths, which av_max_alloc() cannot reach since it forces the first allocation to fail.