VADecoder cannot preperly decode VAEncoder output

[danylosadivnychyi]

I'm playing around with D3D12HelloVAEncode/VADecode. Both seem to be working without crashes, but whenever I write the encoded bitstream to .h264 file, the VLC reader cannot seem to read it.
Also if I read this bitstream in VAEncode and load the data to the VA_H264DEC_BUFFER_INDEX_COMPRESSED_BIT buffer in VADecode, it just shows me some gibberish on the screen (I changed the window resolution resolution in Main.cpp).
@sivileri attached the image decoder produces on the screen for me.

[GameDreamByHuo]

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