Thanks!
The refactoring is now done, some smaller things remain, so a release is to be expected soon (next week at the latest probably).
Performance-wise there isn't really a big difference, though the new version might be faster in some cases
The stream format had to be changed, as I mentioned, though I'm quite satisfied with it now, so if all goes well, it will stay for 1.0 and beyond.
The next release won't see any major new features, though I added an option to restrict the kind of colorspaces the codec will accept (useful to make sure you really give the codec the colorspace you work in and expect - so conversion don't silently happen somewhere). Built-in encoder-side colorspace conversions (direct encoding from RGB to YV12 for example) are expected after this release, and I hope to include them in 1.0.
More to come soon!
Greets,
I.