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Why Does Matrox RT.X2 Use a 720×486 Video Frame Size?

NTSC DV and DVD video both use a frame size of 720×480, but the D1 NTSC Broadcast Video spec is 720×486. The Matrox Axio hardware uses the D1 spec, so to maintain project cross-compatibility between the RT.X2 and Axio platforms for editors using both, the RT.X2 uses the D1 spec.

If you capture using a Matrox DV preset, the video IS captured at the standard 720×480 size, so in the Premiere preview window, the DV image is centered with 3 black lines above and 3 below to fill out the 486 frame size. When exporting to DVD, the 6 extra lines are removed so the export is the proper 720×480 size.

For most editing, you can disregard the extra black lines top and bottom, but there are circumstances where some action is required. If you are doing a Matrox Page Curl or any other effect or transition where the black lines are distracting, just use the CROP function to trim them off. CROP is found in most Matrox effects if you scroll down through the effect parameters. You can also apply Matrox Move & Scale just to use the CROP function.

Note that these black lines are specific to standard-definition projects only and do not appear in HDV projects, as HDV is always 1440×1080 for 1080i/p and 1280×720 for 720p video.

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Why Does Matrox RT.X2 Use a 720×486 Video Frame Size?