Doom9's Forum - View Single Post - Resolutions, Aspect Ratios And The ITU-R BT.601 Standard

valnar · 10th February 2003, 01:54

Since I started a lot of these debates on the validity of the "ITU Standard Checkbox" in Gordian Knot, I took what will be the FINAL step.

I made a DivX out part of my AVIA test disc. We've got perfect circles to measure.

I made four 1MB DivX files. 4x3 and 16x9 each with/without the ITU standard checkbox. I did the aspect error either a perfect 0 or 0.1 (as much as I could with that ITU standard check). Part of the AVIA test disc has 16x9 patterns so you can measure circles there too.

My results? I had perfect aspect ratio on the files without it checked, with BSPlayer and PowerDVD. With the ITU standard, the circles were slightly squished vertically. I can send the files to whomever wants them. They are less than 2MB. I welcome more tests.

Edit: I also did the test on a laptop screen with a set ratio of pixels, so there was no monitor setup inaccuracies, and got the same results.

Edit: (Removed FTP link to AVIA test files. Email if interested.)
-Robert

10th February 2003, 01:54	#13 \| Link
valnar Registered User Join Date: Dec 2001 Location: Cleveland Posts: 519	The end all comparison Since I started a lot of these debates on the validity of the "ITU Standard Checkbox" in Gordian Knot, I took what will be the FINAL step. I made a DivX out part of my AVIA test disc. We've got perfect circles to measure. I made four 1MB DivX files. 4x3 and 16x9 each with/without the ITU standard checkbox. I did the aspect error either a perfect 0 or 0.1 (as much as I could with that ITU standard check). Part of the AVIA test disc has 16x9 patterns so you can measure circles there too. My results? I had perfect aspect ratio on the files without it checked, with BSPlayer and PowerDVD. With the ITU standard, the circles were slightly squished vertically. I can send the files to whomever wants them. They are less than 2MB. I welcome more tests. Edit: I also did the test on a laptop screen with a set ratio of pixels, so there was no monitor setup inaccuracies, and got the same results. Edit: (Removed FTP link to AVIA test files. Email if interested.) -Robert Last edited by valnar; 3rd March 2003 at 14:33.