https://media.ccc.de/v/32c3-7435-replication_prohibited#vide...
Sounds like what happens to me when opening the page. Did you try to click on 'Video' tab or on the 'Play' button? It started the video for me.
ps: live talk https://twitter.com/adereth/status/666774776074133504
Trying to play http://ftp.halifax.rwth-aachen.de/ccc/congress/2015/h264-hd-... directly in the browser works.
Maybe they should just load that in an iframe or something.
Mixed Content: The page at 'https://media.ccc.de/v/32c3-7435-replication_prohibited#video' was loaded over HTTPS, but requested an insecure video 'http://ftp.halifax.rwth-aachen.de/ccc/congress/2015/h264-hd-web/32c3-7435-en-Replication_Prohibited.mp4'. This content should also be served over HTTPS.
FWIW Firefox plays it just fine