R26 – Speed!

The focus on this release is mostly speed. By switching to using tcmalloc in windows some scripts get very substantial performance gains, in some extreme cases over 200% speedup but don’t expect it in every clip. Other parts of the code were also steamlined and cleaned up for some additional minor gains.

The other highlight is as usual bugfixes, a pile of small and annoying things have been fixed and there is now full documentation of the API available. Something most open source projects don’t manage to do ever (sprinkling doxygen everywhere doesn’t count unless it’s readable).

Important script writing detail
If you write a python module with functions to be imported into another script DO NOT store the core object in global scope. This will cause odd behavior since the global scope is only evaluated once but a new core is provided every time a script is reloaded. The result is that you will have two or more cores in the same script and most likely crash or get an error.

YATTA 8-133 Released

The new version can be downloaded from the ivtc.org link to the left. Only for real encoders. See the previous post for the main changes.

Don’t expect regular updates. The existing codebase is so horrible I don’t want to make major changes. Report all bugs you find on IRC.


An ancient evil has returned. The number one IVTC tool for real encoders has been updated to better support modern windows versions. It includes several bug fixes and it’s now system DPI aware so it won’t look so bad. Head to #darkhold on Rizon.net if you’re one of the few who still know how to use it and want to test it.

Still no VapourSynth support though. Too much effort.