For this test we used Cyberlink Power Producer in conjunction with DIVX 6.0 Pro to encode "The Matrix" MPEG2 down to a MPEG-4 high resolution video file.
The Cyberlink software comes with its own time clock to indicate the time taken to encode the movie as well as average CPU usage and average FPS during the encode. We used DIVX 6.0 due to its support for Dual Core CPUs as well as Intel SSE3 and Hyper Threading.
Here we see that the Dothan's core is behind both the AMD K8 and the Netburst systems when it comes to media encoding.
UPDATE ON OVERCLOCKING Overclocking the CPU makes quite a bit of improvement to the media encoding results.