You can play/pause, rewind/fast-forward, jump back 30 seconds and change the volume via the buttons in the bottom left. You may also rewind/fast-forward via the timeline. When doing so, your current location in the video will be timestamped with a green flag, while the location you would like to move to in the video will be indicated with a red flag. The current timestamp and full length of the film are indicated in bottom right, just next to the timeline.