sar 4:3 to 16:9 ratio?

[Norio]

Quick question, whats the correct --sar ratio for converting ntsc 4:3 video directly to anamorphic 16:9, in my case 1440x1080 to 1920x1080. -thanks

[jagabo]

1.333 * 1440/1080 = 1920/1080

[Alex_ander]

Crop 1/4 vertically for 4:3 ->16:9 then resize the result to 1920x1080.
For going in 16:9->4:3 direction crop 1/4 horizontally. No 'sar's' . Even pixel 'geometry' doesn't matter here.

[jagabo]

We're making different assumptions. Alex_ander is assuming the source is 1440x1080 square pixel so it needs to be cropped to a 16:9 frame size (like 810x1080) and resized up to 1920x1080, again square pixel. I'm assuming it's already a 16:9 anamorphic encoding (like HDV) and it just needs to have the PAR (pixel aspect ratio) set to 4:3 (1.33...) (and the OP calling it SAR because that's what x264 and some other programs calls it). Anyway, both answers are here.

[Norio]

We're making different assumptions. Alex_ander is assuming the source is 1440x1080 square pixel so it needs to be cropped to a 16:9 frame size (like 810x1080) and resized up to 1920x1080, again square pixel. I'm assuming it's already a 16:9 anamorphic encoding (like HDV) and it just needs to have the PAR (pixel aspect ratio) set to 4:3 (1.33...) (and the OP calling it SAR because that's what x264 and some other programs calls it). Anyway, both answers are here.

Yeah, your assumption fits my prediciment, the video is already scaled to 16:9 I just need to re-encode back to anamorphic 16:9.

Sorry if the question wasn't clear, but what I'm looking for is the actual --sar ratio for x264. For example, the ratio for NTSC 3:2 to 16:9 is 32:27, it won't input a multiplier like 1.333. I'm sure I could figure it out myself with the right math, but I just want to make sure I have the most widely compatible and standardized ratio.

[jagabo]

1.333 = 4/3 = 4:3 -> width=4, height=3.

[Norio]

1.333 = 4/3 = 4:3 -> width=4, height=3.

Well that was a lot more simple that I thought, I didn't expect the conversion ratio to be identical to the pixel ratio so I was overlooking the obvious. Thanks for the help.

[jagabo]

I didn't expect the conversion ratio to be identical to the pixel ratio

It's just a coincidence.