We had issues with AME hanging with the DNx’s. Generally render them from AE.
From: After Effects Mail List <AE-List@media-motion.tv>
Sent: Wednesday, July 25, 2018 11:26 AM
To: After Effects Mail List <AE-List@media-motion.tv>
Subject: Re: [AE] MXF render
Via the Render Queue, you'd have to go with QuickTime Format and then choose DNxHR/DNxHD as the Video Codec.
If you queue the Comp in AME, you can choose
DNxHR/DNxHD MXF OP1a as the format and encode directly to MXF.
We may be switching our workflow over to DNxHR. I know there is a MOV and MXF wrapper for that codec. How do you render to MXF DNx flavors in AE?