.ts file playback: man, what codec does it use?

I was testing on the P4 3.2 GHz machine with 2Gb of main memory with the same .ts file I used before (from MOV_050817). I started to wonder if the skipping problem is not because of the codec but because of the video file I used, meaning that the video itself has problem because it skipped at the same spot no matter what player I used.

Another mystery was that on my 3.2GHz machine, I only have the following apps/codec installed, and yet all the .ts files was played back fairly OK (except the skipping problem I mentioned above on that particular file).

- Storm Codec 5.0.7
- PowerDVD 5.5

So maybe these apps/codec are all I need? Still feeling confused.