OpenCL™ Developer Guide for Intel® Processor Graphics
2019 Update 4
Note on Intel® Quick Sync Video
Check and adjust the device load when dealing with transcoding pipelines. For example running the Intel® Quick Sync Video encoding might reduce benefits of using the Intel® Graphics for some OpenCL™ frame preprocessing. The reason is that the Intel® Quick Sync Video encoding already loads the Intel® Graphics units quite substantially. In some cases using the CPU device for OpenCL tasks reduces the burden and improves the overall performance. Consider experimenting to find the best solution.