ITV SMPTE-363M enhancements include a URL that points to an HTML file. The HTML file must include information about where the video is displayed in the final output. This information is indicated by the followingácode:

This code can be used to create one of two interactive TV modes: PIP (Picture-in-Picture) mode or Overlay mode.

(Windows only) When you import an enhancement that uses PIP mode, the Avid editing system creates a graphic image (PICT file) of the referenced HTML file. The Avid system stores this graphic in its temporary folder, which you set in the General Settings dialog box. For information about the General Settings dialog box, see the Help or the printed documentation for your Avid editing system.

(Windows only) When you import an enhancement that uses Overlay mode, the Avid editing system creates a matte key for the referenced HTML file. The Avid system stores the media for the matte key on the media drive that you set in the Media Creation dialog box. For information about the Media Creation dialog box, see the Help or the printed documentation for your Avid editing system.

PIP mode lets you create a video image that is scaled to fit a specific area. The HTML file includes code that specifies the size and location of the TV object. The following example shows the size of the TV object:

This code creates a video image as displayed in the following figure. The video has been edited onto the top video track in the sequence and is scaled to the dimensions specified in the HTML file.

You can modify this position in the Avid editing system, as described in Changing the Size and Position of the Video Image (Windows Only).

Overlay mode lets you create a video image that remains full size, with an HTML file superimposed over it. The HTML file includes the following code:

This code creates a video image similar to one displayed in the following figure. Compare this figure to the previous one. The video has not been sized, and the HTML file is overlaid on it.

The HTML file includes dimensions for the content of the HTML page.

The standard dimensions for HTML pages designed for ITV broadcast are 560 pixels by 420 pixels. If the dimensions specified in a referenced HTML file are larger, the Avid system crops the image to the standard size, starting with the upper left corner.