For some time now Netflix has been working to ensure optimal information entropy, it’s an area where small improvements can lead to sizeable benefits for both Netflix and its customers.

The AVCHi-Mobile streams can deliver the same video quality at 15% lower bitrate according to PSNR and at 19% lower bitrate according to VMAF. The VP9-Mobile streams show more gains and can deliver an average of 36% bitrate savings according to PSNR and VMAF.

These optimizations are a solid improvement on previous gains, and I think it will work to make Netflix an increasingly pleasant experience, especially in bandwidth constrained environments.