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You can analyze the mpeg2 file with the registered version of bitrateviewer and save the GOP information to a text file. Then perhaps it is possible to read this text file with the conditional filter? I think there is an option to read data from textfiles in avisynth but I don't remember where I saw it and how to do it...
If you open the mpeg2 file in virtualdubmod you can see the frame type but I don't know how to extract it from there. Maybe you can examine source code files for virtualdubmod?
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Ronny
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