[Bug]: Fill Background Black but Got Green for 10Bits videos

### Which component impacted?

Video Processing

### Is it regression? Good in old configuration?

None

### What happened?

1.Linux @N5105 CPU
2.Use the follow VAAPI code :
VaProcPipelineParameterBuffer pipeline_params;
pipeline_params.output_background_color = 0xff000000;
pipeline_params.output_region = "not the whole surface"
3. for 8bits videos, it's ok,but for 10bits video, the background color will be green.

### What's the usage scenario when you are seeing the problem?

Playback

### What impacted?

_No response_

### Debug Information

_No response_

### Do you want to contribute a patch to fix the issue?

None