another question about pixel ratio adjusting

[compusic]

as we know, computers display video/graphic in square pixels. but many video sources are in rectangle pixels.

if an application, such a s a player, recognizes a video's pixel ratio correctly, if needed, does it do the job of converting to square pixels, or just pass the origional pixel ratio info to the video card's driver, let the video card do the converting job?

as for nle softwares, the situation is different. since the video clips used maybe have different pixel ratios. well, say, there's a pal widescreen project with pixel ratio=1.422. but the clips and graphics imported have such pixels, such as 1.422, 1.0, 1.067, 1.33, 1.5. then will the nle software convert all the clips to 1.422 ratio (in fact there may be one more job of vertical lines converting ), and pass the info to video card driver, or just convert everything to 1.0 square ratio?

thanks in advance.

[Guest]

Please try to keep related questions in one thread. Thank you.

[compusic]

Please try to keep related questions in one thread. Thank you.


well, maybe the 2 questions are some sort of related. but I think they have different focus.

sorry for any inconvenience.

[zambelli]

if an application, such a s a player, recognizes a video's pixel ratio correctly, if needed, does it do the job of converting to square pixels, or just pass the origional pixel ratio info to the video card's driver, let the video card do the converting job?
In DirectShow the information is passed from the decoder to the renderer via the VideoInfoHeader2 interface. It's up to the renderer then to resize the video according to the pixel aspect ratio. VMR7, VMR9 and EVR have no problem doing this - but I'm not so sure about the older ones.

as for nle softwares, the situation is different. since the video clips used maybe have different pixel ratios. well, say, there's a pal widescreen project with pixel ratio=1.422. but the clips and graphics imported have such pixels, such as 1.422, 1.0, 1.067, 1.33, 1.5. then will the nle software convert all the clips to 1.422 ratio (in fact there may be one more job of vertical lines converting ), and pass the info to video card driver, or just convert everything to 1.0 square ratio?
I think the NLE does its own resizing. At some base level it might just convert everything to square pixels for easy matching, but eventually it always has to conform to the PAR of the project when exporting.