There is currently no word on whether this customer installer is still compatible with Mavericks., but that would be my first pot of call for trying to get it to work. However, the MPEG-2 playback component installer will not install in Lion or above, so to circumvent this, Squared 5 made a custom installer as part of their package, see: However, MPEG StreamClip is hard coded to use the MPEG-2 playback component and so still needs it to run. However, since OSX Lion, Apple claim the MPEG-2 playback component is no longer needed by OSX (I believe it's now directly supported by Quicktime).
MPEG StreamClip needs Apples MPEG-2 playback component. Since my needs are modest and occasional, apps like Premiere, etc. I would much prefer to continue to use Streamclip but i will consider another alternative. The save process was very quick and resulted in a file size of zero bytes. After installing Mavericks, I found that MPEG Streamclip no longer could properly save my edited movies.