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8th February 2006, 11:47 | #61 | Link |
Life's clearer in 4K UHD
Join Date: Jun 2003
Location: Notts, UK
Posts: 12,227
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If we are not following the ITU specification to the letter, which most (if not all) software players, don't appear to follow.... then the answer is yes
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| I've been testing hardware media playback devices and software A/V encoders and decoders since 2001 | My Network Layout & A/V Gear |
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8th February 2006, 11:52 | #62 | Link |
n00b ever
Join Date: May 2002
Posts: 627
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sorry for my lame kick in, again. maybe i'm a dumbass but i feel some 'overcomplication' here. imho, u don't need anything else than the par value for making correct resizing.
the equation considered is : dar = par x sar where dar : display aspect ratio (what ratio to be displayed) sar : stream/sample aspect ratio (the original/non-cropped aspect ratio of the stream) par : pixel aspect ratio note, these all are given if your source can be played correctly ! actually, par is a multiplier giving how much the image must be expanded horizontally so as to get the correct/intended dar. that's what all players (should) do. if the stream is cropped (whatever way !), the resulting dar value stays correct if the same par is used for resizing. of course, the picture will be higher or lower but not distorted. it's quite easy to demonstrate. take your favourite dvd, make some different arbitrary but player compliant (say, mod16) cropping and than some short anamorphic encodes. (to go up to the studio logo is far enough for checking) set par value according to what shown on the dvd cover (can be 4:3 or 16:9only !). won't see any ratio distortion. (if someone would tell me how to upload images to doom9, i would show some demo pics, but it's worth to try personally ) the bests y ps if i get wrong what u're talking about, pls, forgive me |
8th February 2006, 11:55 | #63 | Link | ||
20-35 a win for Revolver.
Join Date: Mar 2004
Location: FR.26
Posts: 221
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[Edit] -> I will read all on your www ... it looks great ! Quote:
My way looks really simple beside all your heavy-sci-math-computing So if I'm wrong for 1 ou 2 pixels in height ... what the matter ?! Thanks for answer SeeMoreDigital ! ( from where is your avatar ? a movie, but which ? ) Last edited by Seb.26; 8th February 2006 at 12:06. |
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8th February 2006, 12:10 | #64 | Link | |
Life's clearer in 4K UHD
Join Date: Jun 2003
Location: Notts, UK
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Quote:
Cheers
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9th October 2019, 18:03 | #66 | Link | |
None
Join Date: Jul 2007
Location: The Background
Posts: 307
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This helped me a lot. |
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