I have embedded a video into my Merge Cube space but when I run the programme I hear the video without clicking the button I have coded it to. I cannot see the video because I have set its Opacity to 0 to begin so I assume the whole video is running see through. How do I get the video to only start when the button is clicked?
please make sure that Auto play is turned off (see picture below).
If your video still starts playing with this option disabled, then a part of your CoBlocks code appears to be starting the video. Check out the answer to your different thread for a solution 
Thanks Stefan. Figured it out (more than one video on my space…ugg)