1.using the video duration parsed from video file 2.make compatiable with the recording file with the start time not being zero 3.merge with blank jpg for the last segment audio without video 4.adjust video codec param ,using cfr, 20fps,gop 100
git@123.56.226.173:hubin/merge_av.git commit 6a66277676bf4e32b7866bd736ca02bd34d527fc