The official source [0]'s video file has an en voicover that was captured from the live voicover translation provided by a skilled volunteer at the conference. Use VLC or mpv, if you can't find the audio track selection option in your player.
One thing that bugged me in this otherwise awesome talk, is that the setting with values normal, higher, and high
is called Quality, but the speaker keeps calling it Compression. This is very confusing, since quality degrades with increasing compression.
I don't think there's anything wrong with running a conference in a language other than English. It just won't be accessible to me (and most others in the HN community), and that's OK.
My comment was a regrettably rude way of asking if an English translation is available elsewhere, and fortunately it worked :)
[0]: https://media.ccc.de/v/31c3_-_6558_-_de_-_saal_g_-_201412282...