I got .tsp's (mpeg format) playing in MPlayer/Ubuntu. It's extracted from DVR HDD

Video is great. Audio changes to at least 3 channels. One channel was good audio, but included a 'narrarative' of the action. Another channel played good audio only. A third channel, during the primary video, prompted language selection of the playing device.

I think this is a codec problem...

What do I need to do?

Thanks

(the file plays properly in 'Media Player Classic' when Windows is booted)