视频输入输出库涉及编解码过程的起始和结束操作，即编码开始的时候读取视频文件数据，解码结束的时候写视频文件数据。-Video input and output　relates to encoding and decoding process of the start and end of the operation, i.e., when encoding video file data reading starts, when the end of the write decode video file data.