Version history

Version 1.1.0

More reliable speech recognition

The first step in automatic lip-sync is speech recognition. Rhubarb Lip-Sync 1.1.0 recognizes spoken dialog more accurately, especially at the beginning of recordings. This improves the overall quality of the resulting animation.
More accurate breath detection

Rhubarb Lip-Sync animates not only dialog, but also noises such as taking a breath. For this version, the accuracy of breath detection has been improved. You shouldn't see actors opening their mouth for no reason any more.
Better animation of short pauses

During short pauses between words or sentences (up to 0.35s), the mouth is kept open. Now, this open mouth shape is chosen based on the previous and following mouth shapes. This gives pauses in speech a more natural, less mechanical look.
Builds on Linux

In addition to Windows and OS X, Rhubarb Lip-Sync can now be built on Linux systems. I'm not offering binary distributions for Linux at this time. To build the application yourself, you need CMake, Boost, and a C++14-compatible compiler.

More realistic animation using new, predictive algorithm
Smoother animation due to tweening
Support for non-dialog noises (breathing, smacking, etc.)
Substantial speed improvement through multithreading
More reliable voice recognition
Support for long recordings (I've tested a 30-minute file)
Recording may deviate from specified dialog text
Specified dialog text may contain unknown words as well as numbers, abbreviations, etc.