Select the rotation format to use. The ACL plugin supports three rotation formats: Quat Full Bit Rate, Quat Drop W Full Bit Rate, and Quat Drop W Variable Bit Rate. The Quat Drop W Variable Bit Rate option is almost always the best choice which is why they are set as the defaults. The Quat Full Bit Rate, and Quat Drop W Full Bit Rate options can be used as a safety fallback and for debugging purposes. You can select a format from the following options, using the drop down-menu: