Q: I shot some video upside down or sideways, how do I invert it in Sony Vegas?
Answer: Once your video is on the timeline, press the Event Pan/Crop Tool icon inside the video on the track. Right-click inside the middle of window and select "Flip Vertical".
You can also flip a video sideways by selecting "Flip Horizontal" instead.
Step One:
Step Two:
Alternate Step for Horizontal Flip: