merging several .ts files ffmpeg?

Not sure this is the right platform but I usually get the right pointers from here:

I recorded 2 movies and a documentary from the BBC the other day. It is a satellite receiver and the lot is recorded with an USB stick FAT32. The latter is important cause the files cannot be over 4Gb with FAT32. I programmed the satellite receiver to just record it in one go. (might be 4 hours or so)

So I got 4 files:

bbc . ts

bbc . ts1

bbc . ts2

bbc . ts3

no problem I can play these individually. However, I want to merge these so I can have one file for each movie/documentary. (i.e. three files in all).

I edited a file with the files to be merged and then used ffmpeg

ffmpeg -f concat -i mylist.txt -c copy output.ts

I get a lot of error/warning messages.

I then tried to view the entire file with VLC. Appears to lack the audio, or part of the audio and/or part of the subtitles. Where the individual files all have these and in the same format.

Then I tried just to merge part 1 and 2, but again: No audio, no subtitles.

The BBC also sends a ‘narrator’ audio stream nowadays. This one seems to have the upper hand in the audio, but not always. Subtitles are lost.

What would be the right ‘curse’ in ffmpeg to concatenate these files. In the end I need an MP4 for the three movies/doc for jellyfin

Maybe clear, but I am Not a member of any streaming service. I refuse to pay for more commercials.

Pls help