----- Original Message -----
Just to follow-up a bit on this thread in general. Wim Taymans was assigned to work on it, but simply has not found time to do so. So what I am pursuing currently is have Centriclular (http://www.centricular.com/) do the work for us, just need to shake enough piggybanks first to make it happen :)
As for AAC audio, yes that is a problem, but a lot of Webm files for instance use H264+Vorbis afaik.
WebM is usually VP8 or VP9 video with Vorbis or Opus audio.
Not quite sure what one would gain by mixing H264 + Vorbis, apart from making sure it works equally badly on all platforms :)