OK, I've ripped the Lord of the Rings Extended edition blurays using MakeMKV. I unchecked all the non-english audio and subtitle tracks. I currently have an ATV2 but wanted to future-proof the conversion. I then ran them through handbrake using the ATV3 preset. The only adjustments I made were to boost the gain to 5 and add in forced subtitles. Then I joined the movie halves using mp4tools. This gave me a strange error, saying that the two halves had different framerates. I don't understand how this could happen since I used the same settings. The resulting movie plays through the ATV2, but there is no sound. So, what am I doing wrong?