screen上でカメラを使おうとするとInternal error (couldn't create new video channel)となる

知らなかった。今までこれが出たらマシンがおかしくなったんだと思って再起動してたけど、TerminalからscreenごしにCvCreateCameraCapture()すると出てしまうものらしい
参考 : http://robotics.naist.jp/member/old_members/2008/ato-a/wikisource/OpenCV

OpenCV ERROR: Internal error (couldnt create new video channel)
        in function icvOpenCamera_QT, cvcap_qt.cpp(954)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
        called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...