Remove Commercials Post Processing?

How are the commercials removed with post processing? Is the video file re-encoded with the commercials cut out or are the files split then the commercials cut out then merged back together like what you can do with MKVmerge?

I ask because some of my recording seem like they are not re-encoded and some seem like they have been re-encoded at a lower quality. Are the original recording stored on the server somewhere so I can compare the pre and post processing files or are then deleted after the post processing?

It uses commskip to detect commercials and essentially just cuts out those portions marked by commskip.

It is not re-encoded and there is no original stored.

You can setup your own custom post processing script if you want to re-encode or keep copies.

On mine some shows have issues with commercial skip and some don’t.