Docker Plex HW Transcode

Docker noob here, trying to enable hw transcoding on my 1019. The Plex image supports hw transcode just by adding the optional parameter "–device=/dev/dri:/dev/dri" which I assume should go in the execution field when creating the container. However, when I put it there, it will not allow me to create the container and says "run command format error." any ideas?

submitted by /u/Saguaro_Sunrise
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Source: Reddit