One efftect I like when 'grunging' is edge detect. I have used that on top of the original video on a few tracks with a delay on each 'edge' track to create an interesting effect, well i used it once ages ago and the band liked it, another free job.... cant find the file now.

Some grain and unsharp mask might be suitable grungy.

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Lowering the tone of video since 2004.

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