Set Timers to specify whether the frames in the animation should be changed in response to timer messages, or whether the sequence progresses asynchronously in a separate execution thread. When Timers is true, the frames progress in response to timer messages. This is useful for synchronizing the animation sequence with other actions such as playing a sound track. When Timers is false, the animation is played in a separate thread. 

OnStart 

TMediaPlayer 

Ttimer