I usually make the videos go through Photoshop first after rendering just so the volumetric lights in the background or sometimes jigglebones loop better but if it bothers people so much I could just not add volumetric lights at all or do as you say and directly upload the video to gfycat and hope people will pay no attention to the weird flickering lights in the background. Or if you know of a way keep the lights flickering on every loop I’d be happy to learn.