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Old 1st April 2010, 19:37   #1  |  Link
yair
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math\aspect ratio quest, sorta

hi all,

i have a video sized 2944x1200
i want to downsize it so the width will be around 1800 and the height will keep the ratio AND will be dividable by 16
whats a good method to find it?
willing to crop, realy would like to get the formula so i don't ask this again anytime soon...

Last edited by Guest; 1st April 2010 at 19:53. Reason: rule 12
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Old 1st April 2010, 19:55   #2  |  Link
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Simple arithmetic:

1766 x 720
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Old 1st April 2010, 20:25   #3  |  Link
smok3
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http://smok3.bplaced.net/resize/?ssm...css=&doit=true

Code:
# resizeCalc Avisynth
# pixels = 1278720, DAR error = 0.041
# Crop(Left, top, -right, -Bottom)
Crop(0,2,-0,-4) # 2944x1194(-6px)
LanczosResize(1776,720) # (modw16,modh16)
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Old 1st April 2010, 20:41   #4  |  Link
yair
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thanks for the math, and the link!
i know the avisynth community will deliver

Last edited by yair; 1st April 2010 at 20:44.
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Old 1st April 2010, 21:27   #5  |  Link
SeeMoreDigital
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2944 divided by 1200 = 2.45333

Personally, I'd recommend you adopt the high-def frame size width of 1920 pixels...

Meaning, 1920 pixels divided by 2.45333 = 782.608 pixels high.

The nearest mod-16 value to 782 pixels is 784 pixels.

So the finished frame size (resolution) would be 1920 x 784 pixels.
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Old 2nd April 2010, 00:12   #6  |  Link
yair
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i want it a less then that as i dont play it full screen and i like to have space on the sides.

a bit about the footage-
its a screen capture of my dual screen pc setup.
a 1920x1280 and a smaller 17" running at 1024x768.

i currently use a demo of a timesnapper - it also saves statistics of usage linked to activity timeline
timesnapper screencaptures to jpg every 3 seconds
from there it passes to avisynth
Code:
CoronaSequence("D:\timeSnapper\2010-03-14\*.jpg",textmode=1,size=28,y=1145)
#2944x1200 http://smok3.bplaced.net/resize/index.php
Crop(0,2,-0,-4) # 2944x1194(-6px)
LanczosResize(1808,736) # (modw16,modh16)
ConvertToYV12()
my usual setup is virtualVCR using VH Screen Capture Driver into the MSU screen codec.

i am currently in between encoders,
looking for one that accepts avisynth
(handbrake doesn't, staxrip doent play nice, super! is a messy beast).
i usually go with avs2avi but am looking into FFmpeg, any tips there would be great.





i
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Old 6th April 2010, 01:27   #7  |  Link
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Read my signature

Seriously though, x264 will probably be your best bet. What are you trying to target with your encode?

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Old 6th April 2010, 08:50   #8  |  Link
yair
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im trying to keeping small fonts readable, conserve space and not mess the colors.
as im willing to do the video conversion non-real-time, cpu usage is less important.
but would like the format to be easily editable in sony vegas.

for now i use the msu codec
Code:
avs2avi.exe %IN% %OUT% -c MSUD
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