I used redis for something very similar once before and found that redis was a bottleneck on hd video unless the frames were compressed as JPEG. I came away feeling that it was an easy way to solve the problem but not very efficient.
1080p means, uncompressed, each frame is about 6MB. That is a pretty large message size for redis and the throughput/latency of redis is known to go down.
It may just be a case that redis is not terribly optimized for.