H265 (HEVC) is flowing to the mainstream

The new HandBrake 0.10 seems to contain open source HEVC encoder. HEVC is official 4K BluRay codec and it said to double the data compression ratio compared to H.264/MPEG-4 AVC at the same level of video quality. It can alternatively be used to provide substantially improved video quality at the same bit rate. It can support 8K UHD and resolutions up to 8192x4320.

About HEVC support from the HandBrake 0.10 release blog 

• Using x265 v1.4
• This encoder is still early in it's development, so is missing many H.265 features and optimisations. 
• While this encoder is still fairly new, we have seen some promising results come out of it. It's still under heavy active development and is only going to improve over time!

https://handbrake.fr/