[mythtv-users] .ts files

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Hi

I was rearranging my recordings recently and noticed a lot of files
in the top level of my recording disks.
The default storage group has these directories
 /var/lib/mythtv
 /data/disk1/mythtv/
 /data/disk2/mythtv/

and in e.g /data/disk1/mythtv/ there sit numerous files named like
1024_20180106082900.ts and 1024_20180106082900.ts.png.

I can see they are MPEG transport stream data and .png thumbnails,
and that the 1024_ prefix is the chanid and the rest a start date.
But the question is what creates them and what should be cleaning
them up?
I can't find counterparts in the recordings/ or livetv subdirectories.
All my recordings are DVB-T, no analog signals involved here.

I haven't found anything in the wiki but I'm happy to add something
if people can explain and steer me to the right place to edit.

Kind regards