ffmpeg -i "concat:vts_01_0.vob|vts_01_1.vob" -vcodec libx265 ~/temp/test.mp4
ffmpeg -i test.mp4 -codec:a aac -b:a 128k -ac 2 -af volume=10 -codec:v copy test1.mp4

ffmpeg -i in.mp4 -c:v copy -c:a copy -map_chapters -1 out.mp4

ffmpeg -itsoffset 1 -i vsrc.mp4 -i vsrc.mp4 -c:a copy -c:v copy -map 0:v:0 -map 1:a:0 vdst.mp4