Jose,
please check with amcap.exe (part of the directX sdk, can be downloaded from the web as well - try googling it) if your cams are working with this little application. If they don't, either your direct show configuration is badly messed up or the webcam drivers are not working outside their capture applications. In both cases, gem is not to blame. If they do work, please report back.
with kind regards, thoralf.
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