Simplified FFMPEG video writer (also for OpenFramework) [w/ code]

I want to share a little snippet in case anyone is interested in writing video files from cpp context using FFMPEG, I've made it for usage with OpenFrameworks.
It's basically a simple wrapper around the encoding mechanism of FFMPEG, so you can easily just say which file to write to and start dumping images into it. It will take care of choosing the codec, writing headers and trailers, encode (compress) the frames and write them to the file.
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