If you want black borders for a standard 16:9 resolution, add the appropriate amount of black to the height (and/or width) once you're happy the picture looks right. If you think 1.85 isn't quite right, after cropping the existing black, resize to your preferred dimensions instead, but it's probably better to use the above method rather than resize the existing black along with the picture. The same principle applies to upscaling, so after cropping the black you could resize to 1920x1040 (close to 1.85) and add 20 pixels worth of pointlessness to the top and bottom for 1920x1080. If you really like pointless borders, you could add 16 pixels top and bottom for 1280x720 (720p). Personally, I'd downscale as there's not an abundance of detail, probably to something like 1280圆88 (1280/688=1.86, which is close). Then assuming the remaining picture is supposed to be 1.85, which looks about right, you can resize to any 1.85 dimensions. Something like 22 left, 26 right, 170 top, 168 bottom. It seems pointless and if you add borders for a standard 1920x1080 16:9 aspect ratio and one day buy a TV with a wider display than 16:9, the player will have to add borders to the sides so the picture will match the aspect ratio of the screen. Ie the 1222 height has to be reduced to 1080 on playback (assuming a 1080p display), so the width is reduced by the same percentage, meaning it'd be less than 1914, then the player adds black to the sides for 1920x1080. The video had become smaller On playback, the player has to fit 1914x1222 into a 16:9 "hole", and as the picture is now "taller" than 16:9, the player has to add black bars to the sides. The issue is the width also got reduced and now it doesnt span across the whole width of the monitor.
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