<boolean id="letterbox" _label="Letterbox" arg-unset="-no-letterbox"/>
<boolean id="titles" _label="Show file names" arg-set="-titles"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<boolean id="letterbox" _label="Letterbox" arg-unset="-no-letterbox"/>
<boolean id="titles" _label="Show file names" arg-set="-titles"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>