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Comment by lehmannro | Hacker News Reader

For offline use (in whatever sense that term might be applicable to YouTube) I like clive for ripping the full video and ffmpeg for extracting the audio stream. Does your service use any such tools under the hood?

clive: http://clive.sourceforge.net/

  ffmpeg -i "$in" -acodec libmp3lame -vn "$out"

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Dirpy runs a transcoding platform written using a bunch of libraries that include libavcodec, libavformat, and libavutil, which are some of the same libraries that help drive ffmpeg.

For a more detailed list of a number of the open source software projects in use, check out the Dirpy about page.

   http://dirpy.com/about.py

And of course a huge thanks to all the contributors to open source software the universe over. And thanks for your question :).

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