The Linux version of Media SDK for Servers only has a hardware implementation. The main place where this is a limitation is when getting started with the samples. Since they originated on Windows, which has a software implementation, the samples default to software mode but should work with the -hw flag. You don't actually need it. The main focus of Media SDK's mpeg2 and h264 implementation is on enabling developers to access the amazing speed of Intel's specialized video processing hardware.
Audio support was not included in the first 2014 release but it will be available in the next release (coming soon).
An evaluation version of the Intel® Media SDK 2014 HEVC Software Pack can be obtained from the Media Solutions Portal.