Thank you for your reply.
I want to make it auto-play?
How can I achieve it?
Also I want to ask you,
Background video 20th sec.
The titles appear at 10th sec.
After the first play, it begans to loop between 10th-20th secs
but I really want is it loops between 1th-20th secs every time??
I'm not sure what to tell you with regard to the titles, Ogul. I'm not sure how you created these titles or why they appear at 10 seconds -- unless it is because you have accidentally set the Loop Point for your menu page.
To make an auto-start disc, go to the File menu and select New, then select the option to create a Single-Movie disc.
If you've already created a project and you want to remove the menus and make it auto-start with your movie, you will need to drag the movie in the Project Overview window up to the Disc icon at the top of the panel. Then you can delete the menu from the Project Overview.
There may be confusion between auto-play and auto-start. Perhaps the OP wants a disc that will play on insertion in a PC. In that case it's a matter of how the PC is configured.
If the disc is inserted in a stand-alone player it will auto-start, playing the menu, if present, or the video if there's no menu.