Addendum re: the framebuffer issue

I forgot to comment on this in my previous message, but would it resolve
the issue if we enforced singlethreaded filtering?  If so, I think that
would probably be the best idea for 1.1.0, rather than throwing in a
whole new block of code right before release.  For the majority of use
cases, I imagine encoders could make better use of multiple threads than
filters could anyway.

  --Andrew Church
    [email protected]
    http://achurch.org/