Elgato TURBO.264 HD Application Support

Then, select your favorite preset (including Custom
Presets) under the Use: menu. The Options... button
will reveal the same custom settings window as in
the Turbo.264 HD software.
How does Turbo.264 HD work with QuickTime
Player Pro?
Open a movie using QuickTime player. Choose
Export from the File menu, and then choose the
Turbo.264 HD option from the Export pop-up menu.
Turbo.264 HD Manual
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Application Support