Hello, I have some issues with my ipod pod classic 6/7th gen and ipod nano 5th gen. I am trying to creating media files, "mp4, m4v, or mov" files that have more then one audio file, and working subtitles. The ipod classic has 3 different options that can change a video’s playback. They are Captions, Subtitles, and Alternate audio. I have the "captions" setting working on the ipods by using apple’s compressor program, a fairly recent vision. And I cannot get the "Subtitle" or the Alternate audio" settings to work in the ipods settings. Itunes, quicktime, and my ios 10 iphone can read the subtitles, and the alternate audio, but just not the old ipods. I have put 2 different .scc files in a mp4 container, and put a 2nd audio stream in the files using subler, but the ipods simply just don't read anything. Does anyone here have knowledge from the days of the ipod classic, or any information about what the file formatting is for the files so they are compatible? I could really use some help, I have been trying to figure out how to get all this to work in the last 12 years, and have only be able to get the "captions" setting to work.