Question / Help Does AMD VCE supports my resolution (3440x1440p)?

I'm trying to record gameplay footage with AMD VCE at my native resolution - 3440x1440p (21:9) - but in order to actually start the recording, I have to downscale the resolution all down to 1720x720p, which is less then ideal... Is there some setting I need to change or does the encoder simply not support a greater resolution? I have an i5-4690k and two R9 390X in crossfire configuration.
 
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