However UMD videos are actually at a higher resolution (720x480) and shrunk to fit the PSP's 480x272 display. The advantage in this is that compression artifacts are less noticeable (even less noticeable than MP4's that are compressed at high bitrates) This is due to the averaging of pixels that take place when shrink interpolating to the PSP's resolution - 8x8 image chunks are averaged out to the PSP' screen.
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