Video Encoding Slowness

Hi all,

I'm looking into ripping my DVD collection into WebM format (VP8 video
via libvpx, and vorbis audio via libvorbis).  The following command
works, in that it gives me a suitable quality video with audio in sync:

ffmpeg -i input.vob -aspect 16:9 -vpre libvpx-720p -aq 5 -f webm -y \
  output.webm

However, it takes a long time to encode.  It averages around 6fps.
Bearing in mind that the source file is 24fps, this means that encoding
takes 4 times as long than actually watching the DVD.

This may be usual in the video encoding world, but I've only ever had
experience of encoding audio, which typically happens at a faster rate
than it takes to listen to.

So, I guess my questions are: 1) am I expecting too much, 2) Does other
people's experience match mine or 3) How do I speed this process up?

Thanks,

Matt.

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