Ultimately the question is whether your software is legally classed as a derivative of dvbsnoop. There does not seem to be much consensus in the legal community of exactly what constitutes a derivative when dynamic linking is involved. Note that this issue is outside the scope of the GPL, and so what the GPL people say about it is nothing more than their own (imho biased) opinion. Why don't you contact the author/s of dvb-snoop and ask their opinion on the matter. Regardless of whether you can technically 'get around' the GPL, it is generally good to respect the authors wishes. They might not mind at all.