Hello everyone!
This is my first post, please forgive me if this is not the right place to write this:
I just recently had an issue that was quite pesky with a client who needed to edit video for an installation piece. The original material was shot on a Canon 5D Mark III and the final output needed to be in Apple ProRes (LT) 1440×1080 with 4:3 aspect ratio. I work in Adobe Premiere Pro CC and for the life of me couldn’t understand how to export it correctly. The videos always showed up in VLC and Quicktime as 1440×1080 (1920 x 1080) maintaining the 16:9 aspect ratio even though I chose Anamorphic 1.333 (under the assumption that was correct for 1440×1080)
I went over this many times and finally it hit me that in the export dialogue to change the aspect ratio from 1.333 to square pixel and then “scale to fill” and then it all worked out.

https://cerusmedia.com