Pkviz is a tool for plotting and cycling through and animating a series of network packets captured by tcpdump. What makes it unique is that the packets’ structure is visualized, not any labels and not time itself. Pkviz takes each byte in a packet and plots it out end-to-end, left-to-right, from the first byte to the last. How high the dot gets plotted depends on the value of the byte: bytes with a value of 0 are at the bottom and those which are 255 (0xff) – the maximum value of a byte – get plotted at the top. This might not be interesting for one packet, but that changes when you start looking at thousands of packets. Pkviz can cycle through thousands of packets in the set so you can see what happened on the wire.
ucview is a video image capture application that uses the unicap toolkit. It provides a simple way to parametrize the video device, can capture still images from the video stream, or record the stream as an MPEG file. By using unicap, it can access many different video capture devices like webcams, video grabber boards, IEEE-1394 (FireWire) cameras, and others.
unweave opens each of a list of image files, removes the artifacts generated by weave interlacing, and overwrites the original file (unless told otherwise). The artifacts are removed by simply removing either the odd or the even lines of the image, and interpolating them from the remaining lines.