This video in the Software category will show you how to add a watermark to a video in Sony Vegas. This video tutorial is using Sony Vegas Pro8. Import a video into your timeline on which you want to put a watermark. Then go to the video layers on the left bottom, right click and select 'insert video track'. This will create a blank video layer. Now find a picture that you want to use as a logo and drag and drop it into the blank layer. Edit it to the length of your video. Then go to 'track motion', resize the logo size and choose the position where you want it to appear on the video. You have now successfully added a watermark to your video.
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