p-frame removal and rebuilding

[chane2k1]

I have a MPEG VX video from my sony digital camera its GOP is I,I,P the P-frames are just straight copies of the previous I-frame. I'd like to know if there is a way to remove the P-frames and just build new ones by blending the previous I-frame with the next I-frame so that i have a smoother motion. rather than this play pause play motion. Thanks to anyone who can help me out. oh if possible is there a way to do it in avisynth?

[Guest]

Serve the video with DGMPGDec via Avisynth. Then use Decimate(cycle=3,mode=1) from the Decomb package.

[chane2k1]

now i have another GOP its I,P,P how would i use decimate to only process the I-frames in this?