Adding support for GPU accelerated H.264 hardware decoding on Linux

Adding support for GPU accelerated H.264 hardware decoding on Linux
ID: FR06O03453	Priority: High
Products: NoMachine Client	Target: 6
Status: Approved

Thanks to this implementation, NoMachine is able to use the H.264 hardware decoding on Linux machines with hardware accelerated video cards (GPUs) and providing the Video Acceleration API (VA API, by means of libVA). In all the other cases, the H.264 decoding library will be used. Note that since version 6.6.8 all products provide H.264 software acceleration capabilities.