Subler is an Mac OS X app created to mux and tag mp4 files. The main features includes:

• Creation of tx3g subtitles tracks, compatible with all Apple's devices (iPod, AppleTV, iPhone, QuickTime?).
• Mux video, audio, chapters, subtitles and closed captions tracks from mov, mp4 and mkv.
• Raw formats: H.264 Elementary streams (.h264, .264), AAC (.aac), AC3 (.ac3), Scenarist (.scc), VobSub? (.idx).
• metadata editing and TMDb, TVDB and iTunes Store support.

Clone the repository and include all submodules

git clone --recurse-submodules https://github.com/SublerApp/Subler.git

If you already cloned without submodules and need to add the submodules manually, cd into the ./Subler directory and clone the dependency submodules with

git submodule update --init --recursive

Open Subler.xcodeproj in XCode

Build and run the project by selecting the 'Subler' scheme (Product -> Scheme -> Subler) and clicking the 'Run' button in Xcode’s toolbar.