This determines if your video will auto play every time a visitor visits the site.Options are yes, no or any single whole number. If set to no then it will auto play ONLY THE FIRST time the visitor gets to your site, and show the play button every time after. If set to yes then the video will autostart every single time, not just the first time. Setting a number allows the video to autoplay the number of times you set here, and once that number has been reached, show the play button every time afterwards. So setting this to 5 for instance makes the video autoplay 5 times then reverts to the play button only upon the sixth visit.
This showevery tag determines how long the program will wait in days before playing auto playing again for the particular visitor. So if you set this to 7, the entire logic will start over after 7 days and autoplay will resume and until the preset number has been reached again.