x264

USE flags

• 10bit - Set output bit depth to 10, this may not be compatible with all decoders
• abi_mips_n32 - 64-bit (32-bit pointer) libraries
• abi_mips_n64 - 64-bit libraries
• abi_mips_o32 - 32-bit libraries
• abi_ppc_32 - 32-bit (ppc) libraries
• abi_ppc_64 - 64-bit (ppc64) libraries
• abi_riscv_lp64 - 64-bit (rv64) soft-float libraries
• abi_riscv_lp64d - 64-bit (rv64) double hard-float libraries
• abi_s390_32 - 32-bit (s390) libraries
• abi_s390_64 - 64-bit (s390x) libraries
• abi_x86_32 - 32-bit (x86) libraries
• abi_x86_64 - 64-bit (amd64) libraries
• abi_x86_x32 - x32 ABI libraries
• altivec - Add support for optimizations for G4 and G5/ppc970 processors
• cpu_flags_x86_sse - Use the SSE instruction set
• custom-cflags - Build with user-specified CFLAGS (unsupported)
• debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
• interlaced - enable interlaced encoding support, this can decrease encoding speed by up to 2%
• opencl - Add support for OpenCL.
• pic - disable optimized assembly code that is not PIC friendly
• sse - Use the SSE instruction set
• static-libs - Build static versions of dynamic libraries as well
• threads - Add threads support for various packages. Usually pthreads