[Libva] interleaved_uv problem in decoding H264

[hank peng]

Hi:
I am using libva to decode H264 video on sandy bridge platform, I
found that interleaved_uv is set to 1 while decoding H264 and output
format is NV12. Since my display format is YUYV422 packed format, I
use libswscale provided by ffmpeg, CPU usage is very high for format
convertion. So, I wonder if I can change the output format for
decoding H264, such as YV12?

-- 
The simplest is not all best but the best is surely the simplest!