It finds the best whole number ratios for Output 1 Custom Pixel Aspect Ratio.įor this example of removal of black bars to get a video 720 x 372. I put a calculator for these numbers on the project page link above. You could just take A=9999 and make B=8235. Buzzer!!! You can't enter decimals into the Custom fields and the numbers only go up to 9999. Run the formula for A=1 we get B = 0.8236. You check and the original ratio for this film and it is 2.35. How do you find custom matching whole numbers for your video resize? 32:27 works to change a DVD video source back to 16:9 but what if you crop out the black bars first and get a video is 720 x 372. This is all fine, but the Output 1 Custom Pixel Aspect Ratio entry only takes whole numbers. Let's try just A=1 to see if that is easier. You can run this for any value A and get a B value. So, what does it take to make 720 into 853? The answer is 32/27.0002. We are not actually adding any pixels anywhere. Sure enough, 32:27 is listed in the pulldown Predefined Aspect Ratio to force the change to 16:9. Before I figured that out, I wanted to see what was going on with the mkv encoder - Output 1 settings Pixel Aspect Ratio (DAR).įor example: Say you have a 16:9 720 x 480 DVD with black bars top and bottom.ġ6:9 will show very squashed and not do what you expected to see.ģ2:27 (a ratio of 1.185) works and makes the video look normal in 16:9 format with the black bars in place. I realize now, I don't really need to use Video Output Configure to resize the video, because the Mkv Muxer Force a new default width does the job. I have a calculator for this on my page so you can match any aspect ratio you like. For DVD's that would 480 * 16/9 = 853 and you are done. mkv videos it's much easier to use the Mkv Muxer - Configure and force a new default display width that is just 16/9 * the current video height. It's especially helpful after removal of black bars.įor all. I created an online calculator for video resizing with version 2.7 for Windows.

Php ffmpeg resize without stretching