func parseMp4Files(files []inputFile) (mp4Files map[string][]mp4.Mp4) {
	mp4Files = make(map[string][]mp4.Mp4)
	for _, in := range files {
		fmt.Printf("-- Parsing file='%s' language='%s'\n", in.Filename, in.Language)
		mp4File := mp4.ParseFile(in.Filename, in.Language)
		if mp4File.IsVideo == true {
			mp4Files["video"] = append(mp4Files["video"], mp4File)
		}
		if mp4File.IsAudio == true {
			mp4Files["audio"] = append(mp4Files["audio"], mp4File)
		}
	}

	return
}
func main() {
	mp4.Debug(true)
	mp4.ParseFile(os.Args[1], "eng")
}