Start the video stream with:

  gst-launch-1.0 servosrc url=https://mrdoob.neocities.org/018/ \
    ! videorate \
    ! video/x-raw\(memory:GLMemory\),framerate=50/1,width=512,height=256 \
    ! glcolorconvert \
    ! gldownload \
    ! videoflip video-direction=vert \
    ! theoraenc \
    ! oggmux \
    ! tcpserversink host=127.0.0.1 port=8080