apt - Checkinstall doesn't install package globally

I am trying to compile ffmpeg from sources and create deb package in order to install ffmpeg globally and make it possible to remove it with dpkg -r command.

Here are my commands.

# Installing FFmpeg
cd ~/ffmpeg_sources
wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
tar xjvf ffmpeg-snapshot.tar.bz2
cd ffmpeg
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
  --prefix="$HOME/ffmpeg_build" \

  --pkg-config-flags="--static" \
  --extra-cflags="-I$HOME/ffmpeg_build/include" \
  --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  --bindir="$HOME/bin" \
  --enable-gpl \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libmp3lame \
  --enable-libopus \

  --enable-libtheora \
  --enable-libvorbis \
  --enable-libvpx \
  --enable-libx264 \
  --enable-libx265 \
  --enable-nonfree
PATH="$HOME/bin:$PATH" make
sudo checkinstall --pkgname=ffmpeg --pkgversion="5:$(date +%Y%m%d%H%M)-git" --backup=no \
  --deldoc=yes --fstrans=no --default
hash -r

Everything compiles successfully, deb packages are created but when I try to use ffmpeg I get

ffmpeg: command not found

So that means that ffmpeg still not installed in $PATH directories.

What is wrong with my commands?

The tutorial you mentioned does not use checkinstall because nothing is installed to the system: it "locally installs" the compiled binaries in the ~/bin directory of the user performing the compiling. It does this for a variety of reasons: avoids the complexities of the package management system, avoids messing with system directories, makes updating compiled ffmpeg easier, for shared server users it avoids root/superuser (assuming dependencies are available), and avoids conflicts with the ffmpeg package in the official repository.

Some methods to make your compiled ffmpeg globally executable for all users:

This is easy:

sudo mv ~/bin/{ffmpeg,ffprobe,ffplay} /usr/local/bin

Downside is that it won't be integrated into the package management system, but that shouldn't be a big deal since undoing this is simple.

To "uninstall":

sudo rm /usr/local/bin/{ffmpeg,ffprobe,ffplay}

If you want to use checkinstall to install the compiled ffmpeg binary for integration into the package management system, and so any user can execute it:

cd ~/bin
sudo checkinstall --pkgname=ffmpeg --pkgversion="8:$(date +%Y%m%d%H%M)-git" --default install -Dm755 ffmpeg /usr/local/bin/ffmpeg

This assumes the ffmpeg binary is in ~/bin which it will be if you properly followed the tutorial.

Alternatively, you could remove --prefix="$HOME/ffmpeg_build" and --bindir="$HOME/bin" when configuring ffmpeg, then run PATH="$HOME/bin:$PATH" make, and finally run your checkinstall command from your question if you want to install everything else (libraries, documentation, ffplay, ffprobe) too instead of just the ffmpeg binary.