version: MSS Community Edition 2018 R2
system: Centos 7.4.1078(Core version 3.10.0-693.el7.x86_64)(cmake2.8.12)(binutils 2.25)(gcc 4.8.5)
double check installation:
run `vainfo | grep -v unknown` is OK
run `./sample_multi_transcode -i::h264 ../content/test_stream.h264 -o::h264 test_out.h264 -hw -la` from MediaSamples_Linux_bin*.tar.gz is OK