Downloads an MP3 whenever you add a video to your Watch Later playlist on YouTube.
Uses an IFTTT Recipe and an Automator Folder Action.
** Only works on OSX **
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You can use the Automator workflow as-is and periodically drag-and-drop files from the Dropbox/IFTTT/youtube-dl folder onto the app, or you can install it as an Automator Folder Action to have changes automatically detected.
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Add the IFTTT recipe to your account.
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Done!