tryin to fix my 1.85:1 ws dvd to 1.85:1 ws xvid

[AGK_J]

can i utilize the hidden autocrop options to precise resolutions...if so...how? if anyone knows a way to do this please tell me how...or just tell me what to fill in to get 1.85 with fixed width of any of these examples? please help...ie. 608,640,656,704 or any in between...id prefer with 656

[AGK_J]

if there was a way to calclulate id do it...if i knew how...if not plz consider this an option to add in future version...1.85 ratio!

i remember it was mentioned before that setting a user selected ratio would be too hard or bothersome...ok...no problem as its a hopeful but obviously not necessary...considerin the way autogk is already set up so i can easily get 2.35 ratio which is the only other ratio i bother with(no fullscreens for me :)

...just if theres any way for future versions someday to somehow get 1.85:1 ratio automatically would be great...if not, thanx neways n keep up the excellent work! ur program is much appreciated, id be lost without it...

[len0x]

I don't understand this obsession with exact AR. Why would you want to get 1.85 exactly (and crop some more good material due to mod 16 restrictions) if there are no devices that can display it full screen anyway (as 16:9 is 1.777 AR)?

[AGK_J]

(and crop some more good material due to mod 16 restrictions)? it crops out actual picture? was hopin it would just crop out black bars?

also, figured out how to get it sort of...592x___ and 768x___ seems to set a 1.85:1 ratio....so far for 2.35:1 i only know of 640x___

[len0x]

Cropping is done to preserve AR when mod16 is used for dimensions. So, yes, if needed AutoGK crops more than just black bars to keep correct AR, which is why I don't understand that somebody would need exact AR...

[apollo16]

Dear Lenox

I prefer also me the exact aspect ratio in the DivX file created, but reading more guides it is not possible.

:-((
Is not an obesession, but if I have a DVD to encode I want that the divx resulted is almost equal possible to original movie as succeed if I convert Wave audio into Mp3 audio. (Listening the Mp3, it is equal to original Wave, also in real it isn't, infact the Mp3 -with correct bitrate- have the same quality and depth of Compact disc).

Why into VOB files the different aspect ratio ( 1.33 - 1.77 - 1.85 - 2.35 - 2.40 - 2.45 )
are correctly showed on screen, while encoding DVD using DivX codec is necessary "MOD 16" the dimension
causing in this mode the loss of a movie material.
The only way to maintain the all aspect is maintain black bars (without cropping) with 720x576 dimension ???
There are not other way to by pass this restriction???

Thanks

[manono]

I don't get it either, this wish that no active video be cropped. If you crop only the black bars, that may leave you with an Aspect Error of up to around 3%. Round things, like a ball, start to appear as slight ovals at around 2% Aspect Error. Is that what you want? Things to look stretched or squashed? Even if the error is only 1.5-2%, that's still too much for me. I'd rather have that error lower than that, even if it means cropping a few pixels into the video. Heck, if you watch your AVIs on a DVD/MPEG-4 player, your TV set's overscan will cut off much, much more than that from the sides.

Now, lets take as an example a so-called 2.35:1 movie. How do you know it's really 2.35:1? Do you believe the DVD case? Do you believe IMDB? Well, don't. As near as I can tell, most DVD movies that are labelled as 2.35:1 on the box, can be anywhere between about 2.25:1 and 2.45:1. Most of them these days are closer to 2.4-2.45:1. So, a 640x272, 2.35:1 AVI Movie, if it has correct AR with low Aspect Error, also has video cropped from the sides OK, you say, don't resize by 16s (Mod16), resize by something lower, such as Mod8, or Mod4. But then you lose compression efficiency, as MPEG-4 is encoded by blocks of 16. Read this:

http://forum.doom9.org/showthread.php?t=42708

In it, TheWEF (original developer of GKnot) explains the reasons why GKnot (and later AutoGK) recommends resizing by Mod16:
divx is encoded in macroblocks of 16 x 16 pixels.
e.g.:
640 x 272 = 174080 pixels = 680 macroblocks.
640 x 274 = 175360 pixels (0.7% more) = 720 macroblocks (5.9% more).
more macroblocks - more compression overhead.
for compressibility reasons i highly recommend to at least use w-mod and h-mod of 16 pixels.

AutoGK does it right. If you wish to have it done your way, then use another program which allows you to mess it up.

[Backflip]

It's just a limitation because of various factors, those of which I don't know all. Someone else with better knowledge may list them.

Ya better believe me, I'm even tempted to crop out good picture (even after I see that there is little to no black left to crop out) when I see that the crop ratio is 1.86 %, but then I look at the AR error % (which is '0'). If you're after acuracy -- AR error percent of '0' is ideal. And I believe even an error upto 2% is not that noticeable by an average person. Keep in mind it's fairly easy to get within -0.5% which is a recommended % error.

edit - manono just explained the major reason for using MOD 16, just above^ Also, anamorphic encoding is a headache. I need some calculator program for that :P. /me goes back to other thread

edit2 - hhmm, I admit myself that I do prefer to keep all the picture, or as much as possible without encroaching on the picture. Don't get me wrong though, I do crop right up to the very edge of the picture which usually only means there's a small to insignificant amount of black border (or none at all). If AR error is low that's sweet :)