I’m sharing my experience with TRP recording files. This may help other users.
Some days ago I started to convert my Digital TV recordings in a format suitable for archiving (mp4). And I stuck my head on the file format created by my new video recorder!
The Jepssen Mediabox ST-3 records video streams in several 1,5Gb files: the first file is a .TRP and the following ones have extension .001, .002, .003 and so on.
Each file can be played by KMplayer. They are recognized as MPEG2-TS streams.
If you import individually on the timeline of a video editor (ex: Tmpgenc Xpress/Video Works5 or Womble MpegWizardDVD 5) and join them, the converted file is watchable by every video player but, on every original split point of the source files, there will be frame errors or audio/video flickering.
The result file will trigger when the player reach these points. In the worst cases this could bring audio out of sync issues (happened!).
This because the TRP and following files cannot be joined together in that way.
Using a “simple_attach_together_the_files” utility like HJSplit produces the same behaviour.
These are special SPLITTED streams.
To make a perfect joint of these sources, you have to use one of these two small utilities: H264TS Cutter or TsDoctor.

H264TS Cutter is a freeware utility. Under the OPTION menu there is a “Convert TRP/REC” entry that do this job. When it works (rarely), it works well. But this utility is full of bugs, nearly always crashes. Under a virtual machine is practically not usable, the read/write file function it’s extremely slow.
TsDoctor is a shareware utility that can be used to do the same job better. In addition it can optionally check and fix the video streams. The join streams function works excellently with TRP sources. Select the .TRP and the subsequent files to be joined, enable the check/fix file automatically option (advisable) and press the go button.
Both utilities produce a single file, that can be imported and edited into video editors. This file will not have the errors left by a simple join utility.