This is going to play most videos without transcoding , I made it in 2018 but I was lazy to share this! anyway it still works great.
1 download the profile Samsung Smart TV mod.xml 6.17KB 16 downloads
2 Move it to C:\Users\xxxx\AppData\Roaming\Emby-Server\programdata\config\dlna\user (xxxx=your name)
3- Go to dashboard > DLNA > profile make sure you can see the "Samsung Smart TV mod' on the top.
4- Restart emby