Forcing aspect ratio not working

[burcs]

I'm trying to force aspect ratio on some encodes but it's not taking. I know I can manually set it in mkvtoolnix but would rather skip that bit. I've set it to 4:3 but it ends up being 2.0. Using megui.


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I also don't see an option for 16:9. Thanks.


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[Selur]

Dar != sar
https://en.wikipedia.org/wiki/Pixel_aspect_ratio

[jagabo]

The correct SAR for a 4:3 DAR 720x480 video is 8:9. Note that 720x480 is often really 704x480 with 8 pixels of padding at the left and right. With that type of video the real SAR is 10:11. Keep in mind that not all players will respond to DAR/SAR flags.

[Sharc]

I also don't see an option for 16:9. Thanks.

For 16:9 DAR (Display Aspect Ratio) the SAR (Sampling Aspect Ratio) is 32:27 for an NTSC DVD.
Take note that SAR (Sampling Aspect Ratio) is basically the same as PAR (Pixel Asect Ratio) which you will find in the literature. This often leads to confusion. For mutual understanding it is therefore recommended to spell the acronyms out.

[burcs]

All good info, thanks. I went another route and used an NLE to scale it up uniformly, then nudged it back and forth with keyframes. Wildly inaccurate borders, even in the same "scene". The exported uncompressed avi is seen as 4:3, but good to know in the future for avisynth, thanks.

[hello_hello]

You can set a display aspect ratio when using MeGUI by adding its global DAR variables to the script.
It's the same way MeGUI adds a DAR to a script itself when anamorphic encoding is enabled in the script creator.

To set an exact 4:3 DAR

global MeGUI_darx = 4
global MeGUI_dary = 3

If you load the script and open the video preview, the DAR should be shown at the bottom. There's a "Preview DAR" check box for previewing how it will display. If the "Force SAR" option is set to "Default" in the encoder configuration, MeGUI will calculate the appropriate sample aspect ratio for you (based on the resolution) and add it to the command line for encoding.

https://forum.doom9.org/showthread.php?p=1058927

For a 720x480 NTSC source, assuming you haven't cropped.

DAR 4:3   = SAR 8:9
DAR 15:11 = SAR 10:11
DAR 16:9  = SAR 32:27
DAR 20:11 = SAR 40:33

For a 720x576 PAL source, assuming you haven't cropped.

DAR 4:3   = SAR 16:15
DAR 15:11 = SAR 12:11
DAR 16:9  = SAR 64:45
DAR 20:11 = SAR 16:11