To be honest, I don't know how to do that. As for me, I prefer to convert videos with all audio tracks. The best tool that I have used is M4V Converter for Mac. It is designed for all iTunes users. If you have purchased or rented movies/TV shows from iTunes store, you may knew all iTunes videos are encrypted with fairplay DRM protection, it can be played on Apple devices only. There is no right for you to re-encode or share it to other devices, even you have paid for it. Fortunately, now it is much easier for you to use such a DRM removal tool to crack DRM protection and convert videos from M4V to MP4 with lossless quality. You can catch more info about it on HERE. Wish this tip is helpful to you. Good luck.