Transcoding error with Croma format rgb4

Hello Sir/Madam,

I am using Media SDK 2017 for Windows 8.0.24.271. I am using sample multitranscoder for transcoding the h264 stream. My hardware is Intel Core i7 -4770 CPU and Operating system is Windows 7.

My objective is work on raw Rgb4 frame. My input is input.h264(1920*1080). When I set -i::h264 input.h264 -o::raw output.raw -dc::rgb4 in transcoder sample. And exe throw m_pmfxDEC-> Init failed error. 

If i don't set below parameter then Transcoding Sample exe is running fine.

-dc::rgb4

Please advice me.

Thanking you,

Dhrumil Sheth