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<blockquote data-quote="deecue" data-source="post: 12121" data-attributes="member: 11829"><p>No, all tvs have square pixels.. all computer monitor's have square pixels. all video files/bitmap images have "square" pixels. pixels are pixels. one unit high, one unit wide.</p><p></p><p>when the dv interface came about, this all became hell with the idea of non-square pixels (.9 for NTSC, 1.07 for PAL). 720x480 for NTSC and 720x576 for PAL. but video files in those resolutions with "non-square" pixels, still have same old pixels just like anything else, there is just a flag set at the begining of the encoding to tell whatever device/software to stretch\squish it a certain way during play back so that it is displayed properly when viewing it. luckily, HD has gotten rid of all this nonsense and is fully square pixels. My hope is in a decade or so, the whole non-square thing is finally gone and out of everyone's system.</p><p></p><p>But as far as your PAL resolution of 720x576 having a 5:4 ratio, it does not actually mean that. it means that it has a 5:4 pixel ratio with a 1.07 non-square pixel flag set to stretch it when played back. The 4:3 square pixel equivalant of PAL DV is 768x576. And 768 divided by 720 is 1.0666667 or more reasonably, 1.07. So in essence, your 5:4 pixel ratio video file/stream is being played back at a 4x3 ratio once the non-square pixel flag is taken in to account..</p><p></p><p>Does that clear it up a little bit? Or did I just make more of a mess of things.. :wink: </p><p></p><p>HTH,</p><p>dave</p></blockquote><p></p>
[QUOTE="deecue, post: 12121, member: 11829"] No, all tvs have square pixels.. all computer monitor's have square pixels. all video files/bitmap images have "square" pixels. pixels are pixels. one unit high, one unit wide. when the dv interface came about, this all became hell with the idea of non-square pixels (.9 for NTSC, 1.07 for PAL). 720x480 for NTSC and 720x576 for PAL. but video files in those resolutions with "non-square" pixels, still have same old pixels just like anything else, there is just a flag set at the begining of the encoding to tell whatever device/software to stretch\squish it a certain way during play back so that it is displayed properly when viewing it. luckily, HD has gotten rid of all this nonsense and is fully square pixels. My hope is in a decade or so, the whole non-square thing is finally gone and out of everyone's system. But as far as your PAL resolution of 720x576 having a 5:4 ratio, it does not actually mean that. it means that it has a 5:4 pixel ratio with a 1.07 non-square pixel flag set to stretch it when played back. The 4:3 square pixel equivalant of PAL DV is 768x576. And 768 divided by 720 is 1.0666667 or more reasonably, 1.07. So in essence, your 5:4 pixel ratio video file/stream is being played back at a 4x3 ratio once the non-square pixel flag is taken in to account.. Does that clear it up a little bit? Or did I just make more of a mess of things.. :wink: HTH, dave [/QUOTE]
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