You are comparing 25 an 30 fps IPTV to 50 & 60 FPS IPTV though.second but it does give me a soap opera effect.
Flickering is way more visible on 25 and 30 frames per second images on iptv.
Using auto frame rate can help with this and also motion interpolation may help
Sorry to be a geek, but I have done a lot of testing on this.
There a reason why broadcasters use 50 and 60 fps when broadcasting sports.
If you could compare those to a 25fps Sat or Terrestrial feed you would see the difference.