успешно полностью пометить файл с помощью этой команды
inputCode = new String[]{FileUtils.getFFmpeg(getApplicationContext()),"-y","-i",InputPath1, "-i",InputPath2,"-strict","experimental", "-filter_complex", "[0:v]scale=480x640,setsar=1:1[v0];[1:v]scale=480x640,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1", "-ab","48000","-ac","2","-ar","22050","-s","480x640","-r","30","-vcodec","mpeg4","-b","2097k",OutPutPath};
спасибо ..