720*576 Anamorphic Resolution

meansizzler · 06-09-2006, 5:03 PM

Want to encode a 720*576 Anamorphic video but was wondering what resolution would stretch it to the 16:9 aspect ratio when encoded, 640*360 would work but I want a native one so ???* 576, what is the ???, basically a list of 1.78:1 resolutions would help, 640*360 being one...

meansizzler · 06-09-2006, 5:10 PM

OK been searching and found this..

Quote:

Picture
If you have already decoded a Widescreen DVD to your computer, you will probably find that the picture is still squashed. It is not an error with the ripping process, but rather the computers inability to resize the image as would be done on a normal DVD player. The above picture is a 720 x 576 PAL rip, but when opened in a DVD player it will be resized to something like 852 x 480!

SO is the correct resolution for anamorphic 720*576 material 852 x 480?

redsox_mark · 06-09-2006, 8:33 PM

I'm not sure what you are trying to do?

Normally one would stick with the native 720x576 resolution, with non-square pixels. When playing, the DVD player or PC will keep the correct aspect and scale it to the size of the screen/window.

So in my case, my plasma screen is 852x480 resolution... so it will get scaled to that. But that doesn't mean it is the correct resolution. 1024x576 would be better - that would keep the full vertical resolution... but my screen doesn't support that.

If you are wanting to encode using square pixels, you could encode to 1024x576.

meansizzler · 06-09-2006, 9:01 PM

Quote:

Originally Posted by redsox_mark

If you are wanting to encode using square pixels, you could encode to 1024x576.

Thank's that's what i was looking for, 1024/576 is 1.78:1.., so I will try that...

Mr.D · 08-09-2006, 1:41 PM

1024x576 is the square pixel resolution of 16x9 standard def PAL.
Why do you want it square pixel anyway ? Leave it as squished 720x576 for best quality.

856x480 is the square pixel resolution of 16x9 standard def NTSC

redsox_mark · 08-09-2006, 2:02 PM

Quote:

Originally Posted by Mr.D

Why do you want it square pixel anyway ? Leave it as squished 720x576 for best quality.

856x480 is the square pixel resolution of 16x9 standard def NTSC

Yea, that's what I was asking too.... why do this?

Interesting but not directly related to the original post: PAL 720x576 comes out to 1024x576 exactly when you do the maths (576x16/9). But the NTSC 720x480 comes out at 853.33. NTSC SD displays tend to be 852x480... but I've seen that 856x480 is generally used in editing...

I guess a few pixels either way doesn't matter... and we are lucky we have PAL..

meansizzler · 12-09-2006, 8:34 PM

Quote:

Originally Posted by Mr.D

1024x576 is the square pixel resolution of 16x9 standard def PAL.
Why do you want it square pixel anyway ? Leave it as squished 720x576 for best quality.

856x480 is the square pixel resolution of 16x9 standard def NTSC

Capturing at 720*576 Anamorphic @ 25FPS Uncompressed YUV AVI, when encoding in Windows Media Encoder, just set output to 1024*576 so no need for the player to stretch the picture as some players have problems doing this eg.. "BSPLAYER", why encode at 720*576 when you can use the full 1024*576?...also 1024*576 is not far off HD, my encodes could easily pass as HD, as they look great..., anyway tried Capturing at PAL 60 but the resolution is much lower at 720*480 Anamorphic or 854*480 when encoded which does not look that good..., from now on I will encode at full resolution..., all the time people confusing me with numbers like 720*576 as the resolution for DVD's, when in fact the actual full resolution is 1024*576 if it has a 1.78:1 aspect ratio...same for video games to..., only time DVD's have a 720*576 resolution is if it has a 5:4 aspect ratio, don't know where the 4:3 comes from for full screen video?...anyway will upload one of my captures soon, lets just say you will be blown away by the quality, who said gaming has to be in HD?..

Mr.D · 12-09-2006, 10:29 PM

standard defintion video pixels are not square.
Standard defintion PAL is 720x576 whether its 4x3 or 16x9.
To view it undistorted the image is unsqueazed (rescaled in x as we are talking primarily digital display pipelines)

720x576 becomes 1024x576 for 16x9 (hence square pixel resolution)
720x576 becomes 768x576 for 4x3.

The point is that if you render it out as the square pixel resolution during the re-encode you are just needlessly inflating your data size as you only had 720x576 worth of resolution in the first place.

HD formats are all square pixel.

1024x576 will look the same as 720x576 displayed correctly . It might even look worse if you use a poor algorithm to do the resize , conversely it might look slightly better for the same reason if you use a better quality resize for the square pixel conversion but that's nothing you can't do on the fly with the 720x576 native material and a decent player anyway. You are also wasting encoding headroom on interpolated pixels.

Similar issues with NTSC 720x480 is the non-square pixel resolution , for 16x9 material it has to be displayed as 856x480 to look undistorted. I don't know why you are dabbling with transcoding to "PAL60".

meansizzler · 12-09-2006, 10:53 PM

Quote:

Originally Posted by Mr.D

I don't know why you are dabbling with transcoding to "PAL60".

Some games on the Xbox 360 only work when the console is set to PAL 60 Mode..., and I don't transcode, I compress...the source is uncompressed...., I know about the square pixels and non square pixels..., and 1024*576 square pixels looks very good, and like I said some players Like BSPLAYER do not display non aquare pixel WMV files correctly..., hence the use of the full 1024*576, easier do handle by the player....

Mr.D · 13-09-2006, 8:54 AM

Quote:

Originally Posted by meansizzler

Some games on the Xbox 360 only work when the console is set to PAL 60 Mode..., and I don't transcode, I compress...the source is uncompressed...., I know about the square pixels and non square pixels..., and 1024*576 square pixels looks very good, and like I said some players Like BSPLAYER do not display non aquare pixel WMV files correctly..., hence the use of the full 1024*576, easier do handle by the player....

Well you never actually said you were capturing from a 360 and as I"m not psychic I assumed you were doing some sort of transcode from 625/50 to 525/60.

I really think you are making a rod for your own back with squaring the pixels. You are just creating interpolated pixels that will eat into your encoding headroom. I'd far rather deal with 720x576 non square pixel that I knew someone hadn't messed about with.

meansizzler · 13-09-2006, 12:12 PM

Quote:

Originally Posted by Mr.D

Well you never actually said you were capturing from a 360 and as I"m not psychic I assumed you were doing some sort of transcode from 625/50 to 525/60.

I really think you are making a rod for your own back with squaring the pixels. You are just creating interpolated pixels that will eat into your encoding headroom. I'd far rather deal with 720x576 non square pixel that I knew someone hadn't messed about with.

All WMVHD movies as well as trailers are encoded with square pixels...

Mr.D · 13-09-2006, 1:08 PM

Quote:

Originally Posted by Mr.D

HD formats are all square pixel.

WMVHD note the HD bit , my point is you don't have to do it as a strictly WMVHD file if the original material is 720x576...waste of space. Run it out as an mpeg4. You are just encoding a needless resize.

meansizzler · 13-09-2006, 1:53 PM

Quote:

Originally Posted by Mr.D

WMVHD note the HD bit , my point is you don't have to do it as a strictly WMVHD file if the original material is 720x576...waste of space. Run it out as an mpeg4. You are just encoding a needless resize.

It's the same for WMV, all the blakc bars are croped out and they use square pixels..., HD is just a term, does not mean anything, just a bunch of numbers which people do not stick by....

Mr.D · 13-09-2006, 3:07 PM

I was under the impression you were asking for information on how to do it correctly. If you want to make arbitrary decisions as to how your stuff will look then please yourself.

chrishull3 · 14-09-2006, 10:45 AM

Quote:

Originally Posted by meansizzler

It's the same for WMV, all the blakc bars are croped out and they use square pixels..., HD is just a term, does not mean anything, just a bunch of numbers which people do not stick by....

hd might be a bunch of numbers to you,i guess you have not seen hdv video compared to standared dv.
chris

meansizzler · 14-09-2006, 10:50 AM

OK, uploaded a sample clip, now tell me this does not look as good as the IGN WMVHD Vidoes, even though it is only standard def.., exscuse the poor gameplay..

LINK "Right Click"[Save Target As]

140MB

Mr.D · 23-09-2006, 4:58 PM

Quote:

Originally Posted by meansizzler

OK, uploaded a sample clip, now tell me this does not look as good as the IGN WMVHD Vidoes, even though it is only standard def.., exscuse the poor gameplay..

LINK "Right Click"[Save Target As]

140MB

Can't comment on the IGN quality but this looks like slightly soft slightly wonky colourwise , standard def video. Did you capture this via composite?