Rat 7M Videos Subject 5 - Day 1

All videos for Subject 5, Day 1 in Rat 7M.<br><br>The video naming scheme is s{subject_id}-d{recording_day}-camera{camera_id}-{starting_frame_idx}.mp4.<br><br>Subject ID, recording day, and camera ID match videos to the data in the motion capture and camera calibration parameter .mat files.<br><br>Videos are provided in 3500 frame chunks, with the index of the starting frame in each file denoted by the {starting_frame_idx} portion of the filename.<br><br>Using the 'frames' field in the 'cameras' struct inside 'mocap.mat', the corresponding video file and frame index can be calculated by used frame_idx // 3500 to get the {starting_frame_idx} and frame_idx % 3500 to get the frame in that file. <br>

大鼠7M（Rat 7M）第5号受试对象第1天的全部视频。
视频命名格式为：s{受试者ID}-d{录制天数}-camera{摄像机ID}-{起始帧索引}.mp4。
受试者编号、录制天数与摄像机编号可将视频与动作捕捉（motion capture）及摄像机标定参数.mat文件中的数据进行关联匹配。
视频以3500帧为单位进行分块存储，各文件的起始帧索引由文件名中的{starting_frame_idx}字段标注。
通过读取'mocap.mat'中'cameras'结构体的'frames'字段，可通过总帧索引frame_idx与3500的整除运算得到{starting_frame_idx}，通过取模运算得到该分块文件内的具体帧位置，进而确定对应的视频文件与帧索引。