视频拼接Filter。将2路视频拼成一路输出。非压缩的RGB和YUV格式，输入端格式必须一致，第一路视频决定输出的帧率。写这个Filter主要是为了把两路视频采集到一个文件中，如果只是要把多路视频合成后显示的话，建议使用VMR-9-Video Mosaic Filter. Will be two video output as guarding our way. Non-compressed RGB and YUV format, input must be consistent format, the first video output frame rate decision. Filter wrote this mainly to the two video collection to a document, If only multi-channel video should Synthesis shows the proposed use of VMR-9