How to Separate muitimedia data from network flow to improve the detection efficiency?

[jiangzhw2008 <jiangzhw2008 () yeah net>]

Dear all,
How to Separating muitimedia data from network flow ,so as to improve the whole detection efficiency of Snort?Should I  
design the preprocessor?Is there any other methods that is simpler?Thanks!
    Best regards.
jiangzhw2008 () yeah net

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