I've spent the last few hours searching everywhere I can trying to find a solution to this issue. I'm sure it's out there, but I just can't find anything that works. Hopefully someone can help me out. I have a PC. I have movies downloaded that need subtitles. I have .srt files. I have used some programs to mux the .srt files to the .mp4 files. The subtitles work in VLC, but not iTunes or Apple TV. What am I doing wrong and how can I fix it?