You can't as that would mean the first value of the Intra 8x8 Block in the left upper corner would be 18 or 19 or 20 depending on what HVS matrix you choose! Thats the first issue, and second if you see the values, in intra-block the values do follow totally different as they do in non-intra.
Watch the 8x8 Block architecture here:
Here's a very good explaining article of KIKA from doom9.de where the basics are explained very well .... to me that was enlightnen!
Translated by Googles Translation Tools:
http://translate.google.com/translat...language_tools
(well Google seems to translate it not till the end, so you should do a step by step translation using google)
If you want the notch to become even more compressable, just attack the last two collumns in the matrix, like Done in CCE at very low bitrate matrixes.
As we see our KVCDs only on Television wich is 525/625 Lines based and NOT pixelbased, you won't see that big difference. And as we also use in here things like MA (linear blurring unfilter()) or Merge/Luma/Chroma-Blur in our Scripts, the Image will get already in our pre-processing a bit unsharper. So this ULBR Matrix modding won't do much harm to the final quality on your Tv, but you should test it as I changed to Quality priority instead of max less filesize as I mostly do DVD-R encodings now.
Just change the values in the Notch with "99" as seen in here:
In case of KVCD/KSVCD (as it will be stretched horiz. we ONLY modifiy the last row as shown)
Intra
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.99.99.99
Non-Intra
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.XX.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.99.99.99
In case of KDVD or KVCD 704x576(480) (more horiz. cutting as it won't be stretched that much afterwards)
Intra
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.99.99.99
Non-Intra
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.XX.99.99
XX.XX.XX.XX.XX.99.99.99
But as I said ... for standard TvSets