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It's nice of them that his video is a webm, while the others are mp4s. E.g. try inspecting the <video> on this one: http://media.ccc.de/browse/congress/2014/31c3_-_6430_-_de_-_...

s/is/is only/

And yes, the mp4 version is not just not linked, it's simply not there: http://c3media.vsos.ethz.ch/congress/2014/h264-hd/

All talks are available in WebM. Try inspecting the download button.

When clicking on the download button on his video, there is only a webm video and an opus sound file.

For all the other talks there are also mp4 videos and mp3 audio files.