Transform filter with different input & output media types (crop filter, Delphi)?

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(Delphi)
http://koti.mbnet.fi/akini/delphi/dspack/SimpleTransform.pas.txt
http://koti.mbnet.fi/akini/delphi/dspack/SimpleTransform.zip
http://www.progdigy.com/modules.php?name=Forums&file=viewtopic&t=563

I have been trying to create CropFilter in Delphi. So far I managed to
create filter fine but without cropping.

I want to crop right+bottom side of the original video. Zip has example
256x256 video and I want to output it as 246x246 RGB32 video. Pixels are
manipulated along the cropping. Example now draws a opaque gradient colors.

GetMediaType call should return media type of output pin. I copy input
pin format and then change width,height,lSampleSize,biSizeImage attributes.

DecideBufferSize instructs to use a new cropped size for buffers.

Its like .avi videofile or DX resets everything and force pipeline to
use input pin filter.

Problems:
* Input media type and output media type are always identicals even if I
put 10 pixels crop.

Any (delphi) specilists here can help?
.

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