Constant AV_FRAME_DATA_MOTION_VECTORS

pub const AV_FRAME_DATA_MOTION_VECTORS: u32 = 8; // 8u32

Motion vectors exported by some codecs (on demand through the export_mvs flag set in the libavcodec AVCodecContext flags2 option). The data is the AVMotionVector struct defined in libavutil/motion_vector.h.