Pre-processing to help clean up m3u files

[madasus]

Is your feature request related to a problem? Please describe.
I have a provider who is sending the m3u links for channels as https://domain.com:80/path

I know this makes no sense but i need to clean this up and remove the https and replace with http for m3u editor to play the channels

Describe the solution you'd like
Maybe add the ability to call a script before the playlist update runs? in this case I would

1. wget
2. sed
3. use the local file as a source for the playlist

Describe alternatives you've considered
i'm doing this elsewhere for the moment

Additional context
Add any other context or screenshots about the feature request here.