I have installed TVHeadend on my Synology. I use Emby to watch and record TV. And it is working, by filling in the m3u playlist, wich for me is at http://192.168.1.129:9981/playlist. But what it does is create a playlist with any channel my TV provider has. More then a 1000. I would like to create a custom playlist with only the channels I want to see (and can see for that matter). Is this possible?

You can tag the channels with a specific name then ask for a playlist generated using only channels with that tagname.

eg. Make a tag called custom, add that tag to the channels you want and then generate your playlist with...

http://192.168.1.129:9981/playlist/tagname/custom
That sound really easy. Thanks!