Export HD to NTSC Widescreen — not truly 16:9

If you export HD footage, 1080×1920 for example, to NTSC Widescreen, you end up with 720×480 with rectangular pixels that have a 1.2121 pixel aspect ratio. That means, the display is effectively 873×480 pixels, which is a a screen aspect ratio of about 16.4:9 instead of 16:9. What you end up with is the original video image squashed between thin, vertical black bars on the right and left sides (not the thick black bars you get when you display a 4:3 video in a 16:9 display).

 

If you open the video in an NTSC Widescreen Sequence, you’ll see those black bars. The video image does not fill the screen.

 

This is easily fixed: change the Scale Width value to 102.3 (uncheck Uniform Scale). That puts the image portion of the clip into the proper aspect ratio (and shoves the black bars off the left and right sides of the screen). But I’d rather change the scale of all the clips in a project.

 

Since NTSC has to be 720×480 pixels, if you want to display something at a 16:9 ratio, the pixel aspect ratio should be 1.185 instead of 1.2121.

 

Perhaps an Adobe engineer can explain why exporting HD to NTSC Widescreen creates a video with black vertical bars and how a 720×480 (with rectangular pixels with a 1.2121 aspect ratio) clip can be considered as having a 16:9 aspect ratio.

 

Thanks,

 

Jeff Sengstack

via Adobe Community : Popular Discussions – Adobe Premiere Forums http://forums.adobe.com/thread/700836