How to convert .bvr videos to .mp4 format.
Converting Blue Iris Videos directly to MPEG-4 Videos (.bvr to .mp4 conversion) might be possible, even though your options are limited to using the original Blue Iris security video recording software that was purchased along with hardware.
It appears that your only option is using Blue Iris, which should allow users to export its BVR video recordings in MP4 format.