Signalscape, as I think has been pointed out, has a great screen capture utility. I've been using Screen Recorder for several years. I have always struggled with dCoder (either crashing or refusing to process)but have never had any issues with Screen Recorder. It is a stand alone utility. I am just now learning about Salient Stills screen capture utility, and I understand it also captures audio much like dCoder. Signalscapes screen recorder (at least the version I have) does not deal with audio at all. Most of my DVR cases do not use audio, but now some agencies are doing their interviews with DVR which is almost making it mandatory for me to deal with the audio. I am still waiting for the newest dCoder with audio. Perhaps all of my issues will clear up. I am also happy to see discussion on using S-Video, because sometimes that is my only option. And if I am transcoding a 4 hour interview, S-Video is as important as ever because I have no interest in an uncompressed interview and the S-video looks and sounds pretty decent. (I've never needed to "analyze" an interview)
My point is that there are at least 3 great screen capture tools that we can use, but S-Video is also a great capture tool and has it's place.