Author here. Totally agree that H.264 can be lossless. Generally its lossy. My idea(which I am still working out) is to compress the difference of frames using a rational bloom filter. I previously posted here about using conditional bloom filter that rely on rational k. The idea was to use different values of k based on whether the url was more likely to be malicious than not. This results in a lower fp rate for the same filter size when compared to integer k. I then saw this paper[https://arxiv.org/html/2502.02193v2] was posted recently which describes an almost identical approach(theirs is much nicer). I will do much more rigorous testing as my current setup is a bit sloppy but I hope it illustrates the idea.