Aspect Ratio Setups

[volksman]

Hey All!

I can't seem to find any docs to tell me how to modify the Aspect Ratio section of the config so that I can limit it to 16:9 or 4:3 only (so I don't have to hit F7 a whack of times to find the ratio I want).

I've found the section of Config.xml to edit but no clue what to do with it.

Any help would be very much appreciated.

[chud]

i'm lazy, so i've copied in a wack of text from some instructions that i gave someone else on this forum. in your case it sounds like you want to edit the config.xml file and delete all but two of the aspect ratio settings that work for you (ie, count on your fingers while hitting F7). if you want to know what is going on and how to setup your own exact aspect ratios, hopefully the info below helps...

ok, well 800x600 is 4:3 so (assuming you are outputing to a 4:3 tv/monitor) you should find that the default aspect ratio (0,0,1,1) gives you fullscreen and perfect 4:3. any letterboxed widescreen (widescreen picture but with black bars on top and bottom to make the whole picture 4:3) should also look fine.

if you've got DVDrips of 16:9 material, chances are that the black bars were cropped out (essential for good encoding) and now it is stretched in height. you'll need a custom aspect ratio to "unstretch" it.

if you like math, this is what you need to do. let's define some variables:

Htv - height of TV
Wtv - width of TV
H - height of video
W - width of video
Hsf - height scale factor
Wsf - width scale factor (you won't need this one unless you want to watch 4:3 on a widescreen tv)

Hsf = Wtv/Htv * H/W

GBPVR aspect:
0, (1-Hsf)/2), 1, ((1+Hsf)/2)

you can just use the aspect ratios for the H and W parameters, not the absolute resolutions.

so, for a 16:9 video playing back on your 4:3 screen, you would find:

Hsf = 4/3 * 9/16 = 0.75

so we need to squeeze the height to 75% of the original. to do that and have the picture centered in the vertical, we need to push the bottom up by half of this amount, and the top down by half. in the config.xml change:

<AspectRatio1>0,0.125,1,0.875</AspectRatio1>

for 2.35 material:

Hsf = 4/3 * 1/2.35 = 0.567

<AspectRatio1>0,0.216,1,0.784</AspectRatio1>

note that Htv and Wtv are the height and width of your actual picture (get out the tape measure), not necessarily the video card output resolution. you can imagine your CRT monitor when you would output 800x600 and 1280x1024. both would fill the entire monitor, but one is a 4:3 aspect, the other 5:4!

hope this helps...

[volksman]

Well this is the part that is stumping me:

<AspectRatio0>0,0,1,1</AspectRatio0>
<AspectRatio1>0,-0.125,1,1.125</AspectRatio1>
<AspectRatio2>0,0.125,1,0.875</AspectRatio2>
<AspectRatio3>0.08,0,0.92,1</AspectRatio3>
<AspectRatio4>-0.05,-0.01,1.04,1</AspectRatio4>
<AspectRatio5>-0.05,-0.089,1.04,1.089</AspectRatio5>
<AspectRatio6>-0.05,-0.17,1.04,1.17</AspectRatio6>
<OverlayAspectRatio0>0,0,1,1</OverlayAspectRatio0>
<OverlayAspectRatio1>0,0.125,1,0.875</OverlayAspectRatio1>
<OverlayAspectRatio2>0.08,0,0.92,1</OverlayAspectRatio2>

Is it safe to remove the OverlayAspectRatio or is that for the actual overlays (I'm using VMR9 so again does this affect me?)?

And if I read the above correctly I would only want the following for a 4:3 TV to have 4:3 and 16:9 ratios:

<AspectRatio0>0,0,1,1</AspectRatio0>
<AspectRatio1>0,0.125,1,0.875</AspectRatio1>

yeah?

[chud]

all correct, although i wouldn't really worry about deleting the overlay settings...

[sub]

Just leave the OverlayAspectRatio settings, they not used for VMR.

[teddy3501]

does anyone know what each of the aspects are?

<AspectRatio0>0,0,1,1</AspectRatio0> <!-- 4:3 -->
<AspectRatio1>0,-0.125,1,1.125</AspectRatio1>
<AspectRatio2>0,0.125,1,0.875</AspectRatio2> <!-- 16:9 -->
<AspectRatio3>0.08,0,0.92,1</AspectRatio3>
<AspectRatio4>-0.05,-0.01,1.04,1</AspectRatio4>
<AspectRatio5>-0.05,-0.089,1.04,1.089</AspectRatio5>
<AspectRatio6>-0.05,-0.17,1.04,1.17</AspectRatio6>
<OverlayAspectRatio0>0,0,1,1</OverlayAspectRatio0>
<OverlayAspectRatio1>0,0.125,1,0.875</OverlayAspectRatio1>
<OverlayAspectRatio2>0.08,0,0.92,1</OverlayAspectRatio2>

sub, any chance of including comments in the xml config file?

[sub]

sub, any chance of including comments in the xml config file?

No. Sorry. I provide a GUI for those things I intend the user to change (config.exe).