Issue using DirectShow (QuartzTypeLib C# Wrapper). Decrease/Increase Speed

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C#

directshow

I am using the QuartzTypeLib in order to play MP4 videos. I have tried to increase/decreasing the speed by setting the rate:

mPosition.Rate = 1.5; // Increase rate by 50%

I am getting an exception: {"The method or operation is not implemented."}
I tried multiple options such as stopping, setting the curposition to the current position, then stetting the rate (still throws the exception)
I tried with .AVI and that works fine.

Any suggestions for MP4s??