When using the glare shader, and setting the glare material to “replace Rendered Image with Glare Only,” everything works fine, unless there is not enough hilight to result in a glare, then the rendered image is the result. When rendering frames for an animation, this results in having a series of glare frames that are black everywhere except for the glare effects, and then the frames that have no glare result give you the regular rendering instead of giving what should be a fully black image.
When compositing the glare frames into a video, it means that any frames where there was no result have to be manually edited to be all black, otherwise you get jumps in the frames where the whole scene becomes illuminated like one big hotspot because instead of an all-black frame, you’re lightening the rendered frame with itself. It would make more sense that if there is not enough hilight to result in a glare, that the frame is replaced with all black. Is there a workaround to this, or a bug fix?