Make all audio constant bitrate

[brollin]

Important learning: we cannot use variable bit rate mp3. Wavesurfer and HTML5 audio have issues with desynchronizing the audio and the waveform.

I was using youtube-dl/ffmpeg and downloading almost all of the audio as variable bitrate. We need to run a script to update all of the audio files in S3, ideally in-place. We want to use a constant bitrate, e.g. 256 Kbps.

Helpful commands:

youtube-dl -f bestaudio --extract-audio --audio-format mp3 --audio-quality 256K 'https://www.youtube.com/watch?v=...'
ffmpeg -i The\ Blue\ Whale-yjamrOtMKfE.webm -q:a 256K -map a the-blue-whale.mp3

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