Aspect Ratio Not Correct on TV

[esojmc]

I am weaning myself off of AGK and started using GK except for yesterday when I tried backing up my Raiders of the Lost Ark. I palyed back the avi with my dvp-642 onto my Sony 34" WS TV and the size of the picture was different from the original DVD. The DVD had a one inch black area on the top and bottom. My avi file had a two inch black area on the top and bottom. Other than the picture looking narrower, everything looked fine.

Here are the settings I used in GK:
Codec = xvid
Input Resolution = NTSC
Output Resolution = NTSC Anamorphic (16:9)
Resolution = manually cut off black area and "smart crop all"
W-Modul = 16
H-Modul = 16
Width = 704
Height = 304

Can anyone tell me where I went wrong?

Thanks

[absinthe]

I have two DVP642s, and if I'm not mistaken that unit is optimized for maximum resolutions of 640 x ____. Perhaps that's actually part of the DivX hardware certification. I've definitely noticed that files I've made at 700+ res don't display exactly right. Although if I'm not mistaken they actually looked a bit larger than normal.

Also, movies with wide A/R's, like Raiders' 2.35:1, seem to me (when played from DVD) to be displayed on television with a slight "zoom." With your XviD file, I think you're getting the exact A/R with no overscan area.

-abs

[ricardo.santos]

Try ITU resizing in hidden options

[ricardo.santos]

control+F9 i think

[SeeMoreDigital]

As far as I'm aware all the India Jones movies have a "Theatrical Aspect Ratio" of 2.35:1

Unfortunately none of the Philips DVP6xx range of players support AR signalling detection, so you only have two encoding options: -

01 - Generate an "cropped and resized" encode using say, 640x272 pixels. Or

02 - Generate an "resized" encode using 640x480 pixels (which includes the black mattes).


Cheers

[xDrJx]

just wanted to mention that my encodes with a res of 672x... run perfectly on my DVP630, so there's room for one step up.thats all :D

[SeeMoreDigital]

It might indeed be possible for the DVP6xx range to cope with "cropped and resized" encodes of say, 720x304 pixels to approximate 2.35:1 sources, 720x384 pixels to approximate 1.85:1 sources and 720x400 to approximate 1.78:1 sources....

Has anybody these pixel frame size with their players. And if so, are they displayed at the correct shape?


Cheers

[xDrJx]

the max i tested was a 5 min cropped and resized clip I made with a res of 704x384 which worked fine, but I went back to 672xwhatever to ensure that the entire movie workx. But the aspects of this clip looked fine.

[absinthe]

I encoded the same clip at 640 and at 704, and they definitely looked different. As I recall, the 704 clip looked "taller," as if the player had stretched it vertically somewhat.

I'll give 672 a go. Never tried that one. 672 x 288 would be nice to put some extra rez on wide (2.35:1) movies.

-abs

[xDrJx]

yes, those wide screen movies does have a "good" vertical res :D
I never experienced taller pictures, but I'll give it a shot. My eyesight isn't the best though :o Encoding clip at 640, 672 and 704 hori res right now and will examine

[xDrJx]

OK, did testing with same clip at 640x336, 672x352 and 704x368.
I've watch them 3 times and couldn't tell a difference.
Then I marked the black bars (Letterbox bars?? dunno the word) on my TV (with tape, no MagicMarker ;) ) and voila, you were right.
As the res increases the picture get more streched. But the effect is so minimal that I will stay with 672x... or even 704x... when I feel the need for it.
But good to know and as I said, my eyesight isn't the best :cool:

[SeeMoreDigital]

OK, did testing with same clip at 640x336, 672x352 and 704x368.What "Theatrical Aspect Ratio" are you checking with those pixel frame sizes? They all roughly work out to be around 1.9x:1!!!


Cheers

[xDrJx]

...They all roughly work out to be around 1.9x:1!!!

I know, the point was to check how far the res could go up without the DVP630 screwing it or how far the picture will get streched. See, most movies I encode are PAL and after cropping the AR ist 1.9xxx so that was my first interest.
But I'll check the 2:35 later

[SeeMoreDigital]

Can somebody try this MPEG-4 720x304 2.35.1 (http://82.2.167.237/Uploaded_Files/Doom9_Forum_files/MPEG-4_720x304_2.35.1_Test.7z) test file with their Philips DVP6xx players please?


Cheers

[xDrJx]

As far as I can tell my DVP630 plays the clip just fine. The squares looked good but the colorbars left and right were missing, but I dunno if this is due to the TV no showing the whole picture.

[SeeMoreDigital]

....The squares looked good but the colorbars left and right were missing, but I dunno if this is due to the TV no showing the whole picture.That's due to "over-scan", which every analogue connected player/TV suffers from.... Some more than others!

Does the circle in the middle of the image look "round"?


Cheers

[xDrJx]

That was good :D
At my first (and second) look I'd say yes, but after measuring the circle I have to admit its more an ellipse (main axis horizontal)

[SeeMoreDigital]

Sadly, that's to be expected because 720 divided by 304 equals (approx) 2.37:1... not 2.35:1

If others would like to conduct their own crop/resizing etc tests, here's my MPEG-2/DVD source (http://82.2.167.237/Uploaded_Files/Doom9_Forum_files/MPEG-2_720x576_2.35.1_Source.7z).


Cheers

[xDrJx]

But if I crop the file to lets say 714x304 so I have an approximate AR of 2.35:1 then this should minimize the problem, shouldn't it? I mean if the player can handle this resolution I just have to watch the AR value?

[SeeMoreDigital]

But if I crop the file to lets say 714x304 so I have an approximate AR of 2.35:1 then this should minimize the problem, shouldn't it? Does AutoGK allow you to encode to non "16 pixel" resolutions?


Cheers

[xDrJx]

Hey, why do you assume I use AutoGK :sly: it is because of my "newbish" post, is it? Eah, just kiddin :p I use GK and just wanted to know but forgot to think before posting, sorry! What I meant was that I can crop the source so the AR fits and there's no streched picture. Thanks anyway!!!!

[absinthe]

But to really demonstrate what I'm talking about, we'll samples of the same clip at different resolutions, i.e. 704x304, 672x288, 640x272, etc.

I'm telling you, they (at least 720 vs. 640) definitely look different from one another.

-abs

[SeeMoreDigital]

But to really demonstrate what I'm talking about, we'll samples of the same clip at different resolutions, i.e. 704x304, 672x288, 640x272, etc.

I'm telling you, they (at least 720 vs. 640) definitely look different from one another. Then use my MPEG-2/DVD source to generate some MPEG-4 encode samples.... You will be able to see from the "test cards" circles and squares whether your encode samples are the correct shape ;)


Cheers

[xDrJx]

But to really demonstrate what I'm talking about, we'll samples of the same clip at different resolutions, i.e. 704x304, 672x288, 640x272, etc.

I'm telling you, they (at least 720 vs. 640) definitely look different from one another.

Yes, the player stretches the picture as the resolution goes up. With SeeMoreDigitals test the results goes vice versa, the picture was shown "to small", but those icorrect AR are minimal and I can live with that cause I only realy noticed with measuring :cool: