This is a simple wrapper to HandBrakeCLI, which allow you to quickly convert a group of files, using any HandBrake preset. For convenience, HandBrakeCLI is included in the distribution.
More information available on OSOMac, where the complete application is available for download (if you don't want to compile it yourself). Please also look at HandBrakeBatch's wiki page here on github.
If you want to contribute:
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This code is available under GPL.