description, seek=true, duration=20, need-clock-sync=true
seek, name=First-forward-seek, playback_time="min(5.0, (duration/8))", start="min(10, 2*(duration/8))", flags=accurate+flush
seek, name=Second-forward-seek, playback_time="min(15.0, 3*(duration/8))", start="min(20, 4*(duration/8))", flags=accurate+flush
seek, name=Third-forward-seek, playback_time="min(25, 5*(duration/8))", start="min(30.0, 6*(duration/8))", flags=accurate+flush
stop, playback_time=35.0
