HEVC/H.265 encoder — gained a full RISC-V vector backend in 4.2; Ubuntu 24.04 still ships 3.5 from 2021 with zero RISC-V code
x265 is the leading open-source HEVC/H.265 encoder.
x265 gained a **full RISC-V vector backend in release 4.2** (April 2026), contributed by Sanechips/ZTE. `source/common/riscv64/` now holds ~23 files covering DCT/IDCT, SAD, SATD/SA8D, intra prediction, filters, loopfilter and SAO.
Tags 4.0 and 4.1 have no `riscv64` directory at all — so **Ubuntu 24.04's x265 3.5 (tagged March 2021) contains zero RISC-V code**, and even Debian trixie's 4.1 predates the backend. Upstream publishes no binaries for any architecture.
GPL-2.0-or-later — https://bitbucket.org/multicoreware/x265_git/src/master/COPYING
| Version | Date | Assets | |
|---|---|---|---|
| 4.2 | 2026-08-26 | 1 file(s) | view → |
| 4.2 | 2026-08-12 | 1 file(s) | view → |