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Only a subset of Adobe media encoder is installed with Photoshop and a limined number of Presets and with what is installed you can not create additional presets as far as I know. DPX only has three preset frame sizes two are 16:9 and one is 2:1 aspect ratio. With H.264 instead of DPX you can set the frame size you want.
If you have Adobe Media encoder installed abd created the DPX preset you want to try copying the preset file int Photoshop DPX Video Presets folder
Thank you sir. The copy of the setting worked, there is now a 2048x1496 16mm DPX option! Not sure why Photoshop needs its own AME settings, nor why users must do this "manually," but it's working, and I know how now.
I was able to find the setting that I had saved by searching for the name I gave it, but the path (at least on the Mac) of that directory is:
~/Documents/Adobe/Adobe Media Encoder/11.0/Presets
Nice one JJMack.
I didn't realise you could copy additional presets across. Good to know
Most likely because Photoshop is not useing the Adobe Media Encoder it using a subset of the product included in Photoshop.