Handbrake is good but you should check out IMFE https://x265.github.io it's a really user friendly and surprisingly well made package. I quit handbrake and have been using this for a whileCome on guys the answer is pretty obvious. You have to convert the file into a format that doesn't have A52 (AC3) codec. The best software I've seen that is supported on both Mac and PC is Handbrake. It is completely free and it already has presets for each device and it will usually convert it into AAC.
https://x265.github.io