VideoHelp Forum


Try NordVPN to access Netflix or other streaming services from any country and also surf safely!
+ Reply to Thread
Results 1 to 10 of 10
Thread
  1. If a 16:9 Widescreen has a Pixel Display Ratio of 1.2121:1 then what is the Pixel Display Ratio for a None 4:3 Widescreen?
    Quote Quote  
  2. 16:9 widescreen only has a pixel aspect ratio of 40:33 (1.2121...) if the frame size is 704x480. What's a "Pixel Display Ratio"? If you're asking what's the pixel aspect ratio for a 704x480 frame of 4:3 display aspect ratio video -- it's 10:11 (0.9090...).
    Quote Quote  
  3. Member dellsam34's Avatar
    Join Date
    Jan 2016
    Location
    Member Since 2005, Re-joined in 2016
    Search PM
    Originally Posted by biferi View Post
    If a 16:9 Widescreen has a Pixel Display Ratio of 1.2121:1 then what is the Pixel Display Ratio for a None 4:3 Widescreen?
    In what resolution?
    Quote Quote  
  4. Member Ennio's Avatar
    Join Date
    May 2005
    Location
    Netherlands
    Search Comp PM
    Any resolution, display aspect ratio and pixel aspect ratio are related in this general formula: PAR x SAR = DAR
    Last edited by Ennio; 18th Jun 2021 at 03:27.
    Quote Quote  
  5. This and the sites linked there, may be helpful,..
    Last edited by Selur; 21st Jun 2021 at 10:59.
    users currently on my ignore list: deadrats, Stears555
    Quote Quote  
  6. Member dellsam34's Avatar
    Join Date
    Jan 2016
    Location
    Member Since 2005, Re-joined in 2016
    Search PM
    Originally Posted by Ennio View Post
    Any resolution, display aspect ratio and pixel aspect ratio are related in this general formula: PAR x SAR = DAR
    No not any resolution, A resolution has to be defined to set the PAR, let's say we have 1440x1080 the PAR (Pixel Aspect Ratio) will be 1:1 or square pixel, If I have 720x480 the PAR will be 8:9 non square, For the example that Jagabo gave above 704x480 the PAR is 10:11, Assuming a 4:3 DAR (Display Aspect Ratio) for all cases according to what the OP is asking for, So no not any resolution.


    Originally Posted by Selur View Post
    This and the sites linked there, may be helpful,..
    Your link is dead.
    Last edited by dellsam34; 20th Jun 2021 at 18:35.
    Quote Quote  
  7. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    This is the link:
    https://forum.selur.net/Thread-INFO-About-pixel-aspect-ratios--597

    It's hard to know exactly what the OP is asking, there's no context to the question at all
    Quote Quote  
  8. Member Cornucopia's Avatar
    Join Date
    Oct 2001
    Location
    Deep in the Heart of Texas
    Search PM
    Originally Posted by Ennio View Post
    Any resolution, display aspect ratio and pixel aspect ratio are related in this general formula: PAR x SAR = DAR
    Those followed remarks bring into focus the need to no longer use the "SAR" shortcut crutch.

    The true, universal formula, which works in ALL cases - including those requiring transformation to different sizes or ARs - is:
    Code:
     DAR = Horiz rez / Vert rez * PAR
    , where DAR = display or frame AR, and PAR = pixel or sample AR.
    This formula satisfies dellsam34's resolution variability requirements, and holds true for all the formulae discussed in Selur's threads.

    The OP is expecting specific answers to a generality question with an unspoken agenda. Jagabo's answer was probably the best attempt to get to the heart of the spirit of the question, but knowing the OP's history, it might never be sufficient.


    Scott
    Quote Quote  
  9. Originally Posted by dellsam34 View Post
    Originally Posted by Ennio View Post
    Any resolution, display aspect ratio and pixel aspect ratio are related in this general formula: PAR x SAR = DAR
    No not any resolution, A resolution has to be defined to set the PAR, let's say we have 1440x1080 the PAR (Pixel Aspect Ratio) will be 1:1 or square pixel, If I have 720x480 the PAR will be 8:9 non square, For the example that Jagabo gave above 704x480 the PAR is 10:11, Assuming a 4:3 DAR (Display Aspect Ratio) for all cases according to what the OP is asking for, So no not any resolution.
    The equation can't be wrong, it is the definition of the system. Just because some commercial systems limit frames to particular dimensions and display aspect ratios (and hence pixel aspect ratios) doesn't invalidate the equation. They all follow the equation. But in theory, any display aspect ratio can be produced from any frame dimensions given the correct pixel aspect ratio -- as defined by the equation.
    Last edited by jagabo; 20th Jun 2021 at 21:18.
    Quote Quote  
  10. Member dellsam34's Avatar
    Join Date
    Jan 2016
    Location
    Member Since 2005, Re-joined in 2016
    Search PM
    The question is not wrong, it is just not specific. It's like studying the caracteristics of a fluid where we have a general formula defined by pressure P, temperature T and volume V PV=nRT, We know the fluid behaviour based on the general formula but unless we know exactly what fluid is (oil, water ...) there is going to be no specific numbers of P, T or V. I know it's a weird analogy but that's what I was trying to explain in my earlier post.
    Quote Quote  



Similar Threads