How can I install tvheadend server un rock64?

[gedas07]

You can try out the below method that listed on their wiki page.

Raspberry Pi / Raspbian armhf
Unofficial Raspbian packages are provided by mpmc for both Raspbian Jessie and Stretch.

• These builds are done manually and may lag behind, however I'll do my best to keep them updated until the official repo is able to provide the packages.
  
• There's no transcoding support, mainly because the Pi isn't powerful enough to do software transcoding and hardware transcoding is not yet available.
  
• There is no changes to the code whatsoever for these builds.
  
• Make sure to enter the distro as raspbianjessie/raspbianstretch and not jessie/stretch.
  

Usage
To use this repository follow the official usage guide - for bintray, but change the repository URL from https://dl.bintray.com/tvheadend/deb to https://dl.bintray.com/mpmc/deb and replace DISTRO with raspbianstretch or raspbianjessie.
Example:
echo "deb https://dl.bintray.com/mpmc/deb raspbianstretch stable-4.2" | sudo tee /etc/apt/sources.list.d/tvheadend.list

Hello i add this to sources.list
echo "deb https://dl.bintray.com/mpmc/deb raspbianstretch stable-4.2" | sudo tee /etc/apt/sources.list.d/tvheadend.list
And when i do sudo apt-get update , that is the answer

Reading package lists... Done

N: Skipping acquire of configured file 'stable-4.2/binary-arm64/Packages' as repository 'https://dl.bintray.com/mpmc/deb raspbianstretch InRelease' doesn't support architecture 'arm64'