How to make a .deb file from compiled version?

[ksb749]

I have been able to compile a Jellyfin Media Player version for aarch64 (Raspberry pi 400) with these commands:

OS: Raspi OS (latest based on Debian bookwork).

Install dependencies:
sudo apt install build-essential autoconf automake libtool libharfbuzz-dev libfreetype6-dev libfontconfig1-dev libx11-dev libxrandr-dev libvdpau-dev libva-dev mesa-common-dev libegl1-mesa-dev yasm libasound2-dev libpulse-dev libuchardet-dev zlib1g-dev libfribidi-dev git libgnutls28-dev libgl1-mesa-dev libsdl2-dev cmake wget meson nasm ninja-build python3 g++ qtwebengine5-dev qtquickcontrols2-5-dev libqt5x11extras5-dev libcec-dev qml-module-qtquick-controls qml-module-qtwebengine qml-module-qtwebchannel qtbase5-private-dev curl unzip

Compile:
mkdir ~/jmp; cd ~/jmp
git clone https://github.com/mpv-player/mpv-build.git
cd mpv-build
./use-mpv-release
./update
echo -Dlibmpv=true > mpv_options
./rebuild -jnproc
sudo ./install
sudo ln -s /usr/local/lib/aarch64-linux-gnu/libmpv.so /usr/local/lib/aarch64-linux-gnu/libmpv.so.1
sudo ln -sf /usr/local/lib/aarch64-linux-gnu/libmpv.so /usr/local/lib/libmpv.so.2
sudo ldconfig
cd ~/jmp/
git clone https://github.com/jellyfin/jellyfin-media-player.git
cd jellyfin-media-player
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=/usr/local/ -G Ninja ..
ninja
sudo ninja install
rm -rf ~/jmp/

I am able to launch and play media, but how do i create a .deb file, for easier installation in the future? :-)