Subler is a free and open source MP4 muxer and editor that you can use to add tx3g subtitles, video, audio and chapters tracks compatible with Quicktime in mp4.
Here are some key features of "Subler":
· Creation of subtitles tracks, compatible with all Apple`s devices (iPod, AppleTV, iPhone, QuickTime).
· Import of video, audio, chapters and subtitles tracks from mov and mp4.
· Metadata editing.
