I have an .mp4-file, encoded from DVD with Handbrake. Now I'd like to add an extra audio track (with another language) to the .mp4 file but I haven't found a good tool to do this. Any suggestions?

Any Video Converter Pazera Free MP4 Video Converter Miro Video Converter XMedia Recode Free WebM to MP4 Converter. Let’s check these tools. After installation, open its interface and then use Add ...