To generate an instance of a player, you insert the shortcode and it handles everything for you. You can use the shortcode generator that appears in the post/page edit screen to have the shortcode generated for you.
If you want to just get a signed URL, you’ll want to use this function:
smarts3_get_url($url, $expiration = '10 minutes')
That will return just the URL already signed for Amazon S3. You can look in functions.php in the plugin to see all of the available template tags.
When I try adding the video from Add S3 Video on my post/page, it asks me to enter my video URL, my videos are protected on S3, they can be accessed only via expiring URLs which are supposed to be generated during page load, so what should I enter there?
You enter the URL that Amazon S3 gives… just the base unsigned URL. SmartS3 uses your Access Key and Secret Key (that you enter on the settings screen) to sign the URL for you.
