Media encoder is changing my aspect ratio

[PufPaf11]

Hi, guys!
I have a video animation created in Adobe Animate that is 1440 x 1080.
I keep on trying to convert it to H.264 with Adobe Media Encoder, but all I get is a smushed-height video.
I have selected the Match Source - High Bitrate option, and I have unchecked the Aspect and changed the HD Anamorphic option to Square Pixels(1.0)... and still nothing works.

I tried playing with the Source Scaling options, but nothing works again.

Can you help me?

[Averdahl]

I have a video animation created in Adobe Animate that is 1440 x 1080.
I keep on trying to convert it to H.264 with Adobe Media Encoder, but all I get is a smushed-height video.
I have selected the Match Source - High Bitrate option, and I have unchecked the Aspect and changed the HD Anamorphic option to Square Pixels(1.0)... and still nothing works.

I tried playing with the Source Scaling options, but nothing works again.

Can you help me?

By @PufPaf11

1440x1080 with a PAR of 1.0 will look odd since a PAR of 1.333 is the expected PAR if you want the 16:9 frame.

Full HD is 1920x1080 with a PAR of 1.0. When HDV came it was 1440x1080 and had a PAR of 1.333 to stretch the width from 1440 to 1920 to make the image look normal in a 16:9 frame. (1440x1,333=1920)

The best tip i have is to always use 1920x1080 with a PAR of 1.0 in Animate, export as 1920x1080 (1.0) as well to avoid all issues. 

[PufPaf11 · Accepted solution]

Okay, thank you for the useful information...

I think I found a solution myself - I just added white space on each side of my 1440x1080 video so it is 1920x1080, after I export it I change the dimensions to 1440x1080 and play with the scaling options.

The point is that I found the solution myself, I hope it helps someone.