21:9 video editing software

[quantumnoire]

Really struggling to find any editing software that supports 21:9, they always want to export it in 16:9 with black bars. I can upload straight to youtube and have it be 21:9 but when i then add commentary to the video in the youtube video editor the video then goes back to being 16:9 with black bars. Any help would be MASSIVELY appreciated.
Thanks

[LeRok3T]

Adobe Premiere Pro CC