Export the MP3 stream from video.

Each and every new re-encode of an audio-stream will have a negative impact on the quality. In many cases, that already happens when Youtube converts the uploads to the proper formats and qualities it uses on the website. It's not the best idea to re-encode the whole thing again after downloading it. I would therefore like an option where your application merely exports the existing MP3 stream from the Youtube video instead of re-encoding it to MP3. Your 320k quality isn't needed anyway and that will only lead to wasted space in the long term.