HARDKERNEL ODROID-XU4 User Manual
Also see for ODROID-XU4: User manual
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33 ODROID-XU4 USER MANUALand 1080p as Full HD. The following comparison table lists the nativedisplay resolutions along with some sources that use these resolu-tions.Standard Resolution Aspect Ratio Refresh Rate Typical Sources1080p 1920 x 1080 16:9(1.78:1) 24Hz, 50Hz, 60Hz HDTV, Blu-ray1080i 1920 x 1080 16:9(1.78:1) 50Hz, 60Hz HDTV, Blu-ray720p 1280 x 720 16:9(1.78:1) 50Hz, 60Hz HDTV, miniDVAs a comparison, the standard DVD Video format uses a displayresolution of 720 x 480 with a 4:3 aspect ratio (non-widescreen). Thisresolution is also referred to as D-1 video and is the standard used orminiDV digital camcorders.Progressive vs Interlaced Video1080p and 720p are progressive video formats. For these for-mats, a complete video image is transferred for each frame of thevideo signal, so that a 60fps video displays 60 complete, full framesper second. This format is visually superior to interlaced video, and ingeneral should be used when supported by your display.1080i and 720i are interlaced video formats, and video interlac-ing is the historical standard for broadcast video. In interlacing, twoframes (or more correctly, fields) are transferred for each frame of thevideo signal, so that a 60fps video has 30 complete, full frames persecond. The display device sends the two fields to the screen in thehorizontal odd and even (or interlaced) pixel positions. Given the vi-sual persistence of the human eye, this reconstruction of full frames isundetectable to the viewer.In general, faster frame rates result in a visually smoother videoplayback, and interlacing results in a halving of the native frame/fieldtransfer rate because two fields are required for the full image. Framerate and visual experience are subjective, however. Traditionally, mov-ies produced with conventional film use a 24 frames per second rate,and many viewers prefer the cinematic experience that 24fps videoprovides. In fact, much of the professional video produced with high-end gear is actually shot at 24fps, and later converted to video framerates to provide the look and feel of cinematic film.Video DownconversionWhen selecting a screen resolution for your XU4, you shouldfirst consult the specifications for the display that you plan to use. Ingeneral, using the native resolution of your display will provide thebest performance and quality.For example, if you use a display that only supports native 720p,and you set your XU4 to a 1080p screen resolution, it will probablyChapter 3 |
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