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See the transcode links for http://commons.wikimedia.org/wiki/File:%C2%BFQu%C3%A9_es_Wikipedia%3F.ogv

looking at 
http://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/%C2%BFQu%C3%A9_es_Wikipedia%3F.ogv/%C2%BFQu%C3%A9_es_Wikipedia?.ogv.360p.webm

ok that url contains a ? if i escape that
http://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/%C2%BFQu%C3%A9_es_Wikipedia%3F.ogv/%C2%BFQu%C3%A9_es_Wikipedia%3F.ogv.360p.webm

the video loads.

now one *only* needs to find what part unescapes '?'

and a fix for review at https://gerrit.wikimedia.org/r/#/c/33294