videonoob
22nd February 2006, 17:22
I'm really hoping that this is the right forum as i've been warned before..
TV (ntsc) resolution is (480i) 440x480 which is 211,200 pixels. Now we also know that most dvds and at 720x480 which is 345,600 pixels.
Now the difference is in the way the material was originally recorded and the way the information is interpreted. Anamorphic DVDs (widescreen) are written to disc with the image squished horizontally. When played back on a widescreen TV this is then stretched out (no new pixels, the image is merely stretched) to give the correct look. On a standard definition TV the image is stretched out and letterboxed. The pixel count is never higher than 720x480 - it's all about pixel shape.
But here's the thing, when you play a dvd on a computer or HD TV at 1280x720 resolution the dvd movie still looks pretty good and Sharp. But 1280x720 is 921,600 pixels, nearly triple the amount of resolution that's on a DVD. So the DVD video is getting stretched nearly 3 times it's size to fill the HD screen.
so here's my feeling/question, if the above is true then shouldn't a 368x208 video file still look pretty good/sharp when played back on the psp? I mean yes we're not using the full resolution of the psp but based on the above, dvd's aren't recorded with HD resolutions in mind either yet they still look pretty good when played on HD TVs.
The psp is limited to 76800 pixels. And that the psp resolution is 48x272 or 130,560 pixels.
So imagine that 368x208 is like our "dvd" so to speak, and the psp is our "HD" TV. And in that sense we have the same situation as the DVD and HD TV from above. We're stretching a 76,544 pixel file to fill a 130,560 pixel space. Sure it's not enough pixels but we're only doubling our space not tripling so quality shouldn't be that much worse on the psp. Just like dvd on a HD TV isn't that much worse on a DVD on a stand def TV.
The only thing is whether the bitrate plays an important role. And i'm guessing that yes. So assuming that if one was willing to use 2048kbps the resulting 368x208 video file should look pretty good even though it's getting stretched and not full resolution
TV (ntsc) resolution is (480i) 440x480 which is 211,200 pixels. Now we also know that most dvds and at 720x480 which is 345,600 pixels.
Now the difference is in the way the material was originally recorded and the way the information is interpreted. Anamorphic DVDs (widescreen) are written to disc with the image squished horizontally. When played back on a widescreen TV this is then stretched out (no new pixels, the image is merely stretched) to give the correct look. On a standard definition TV the image is stretched out and letterboxed. The pixel count is never higher than 720x480 - it's all about pixel shape.
But here's the thing, when you play a dvd on a computer or HD TV at 1280x720 resolution the dvd movie still looks pretty good and Sharp. But 1280x720 is 921,600 pixels, nearly triple the amount of resolution that's on a DVD. So the DVD video is getting stretched nearly 3 times it's size to fill the HD screen.
so here's my feeling/question, if the above is true then shouldn't a 368x208 video file still look pretty good/sharp when played back on the psp? I mean yes we're not using the full resolution of the psp but based on the above, dvd's aren't recorded with HD resolutions in mind either yet they still look pretty good when played on HD TVs.
The psp is limited to 76800 pixels. And that the psp resolution is 48x272 or 130,560 pixels.
So imagine that 368x208 is like our "dvd" so to speak, and the psp is our "HD" TV. And in that sense we have the same situation as the DVD and HD TV from above. We're stretching a 76,544 pixel file to fill a 130,560 pixel space. Sure it's not enough pixels but we're only doubling our space not tripling so quality shouldn't be that much worse on the psp. Just like dvd on a HD TV isn't that much worse on a DVD on a stand def TV.
The only thing is whether the bitrate plays an important role. And i'm guessing that yes. So assuming that if one was willing to use 2048kbps the resulting 368x208 video file should look pretty good even though it's getting stretched and not full resolution