UPDATE 2: PHOTIOS provides some explanation for what’s happening in the video:
The video shows two consecutive days. During the first day you see a group of people brought to watch the trial and execution. It occurs out at the execution ground with the posts prepared on the other side of a van. The trial takes about twenty minutes. The crowd is then led around the van and two of the prisoners are executed, the other nine sentenced to prison terms. The crime? Crossing into North Korea from China numerous times to help North Koreans escape and being paid by a broker in China to do it. Immediately after they are shot you can here a guard ask loudly “Are they dead?”.
On the second day the “trial” is even quicker, with the execution posts being put up during the trial. One man is executed for the same crime. Following the execution a guard loudly announces to the crowd, “this is what you get if you do not respect and work for Kim Jong Il Shogun”.
Here is video footage from Japanese TV of the public execution that went on in Korea (Click here and click on the WMV for the very last entry on the bottom if that doesn’t work). Kim Jong-il previously denied reports (from a defector) that there were public executions going on, but here is undeniable proof. Thanks to the Marmot for cluing me in on the story.