builds and installs ffmpeg with nvenc (debian)

ffmpeg-nvenc.sh

#!/bin/bash
# builds and installs ffmpeg with nvenc (debian)
  
# install nv codec headers
if [ ! -d nv-codec-headers ]; then
    git clone https://git.videolan.org/git/ffmpeg/nv-codec-headers.git
fi
cd nv-codec-headers
git pull
sudo make install
cd -

# install ffmpeg deps
sudo apt build-dep ffmpeg

# build ffmpeg entirely in ram
mkdir -p ffmpeg
sudo umount ffmpeg
sudo mount -t tmpfs -o size=10G tmpfs ffmpeg
cd ffmpeg
apt source --compile ffmpeg
rm -v libavcodec-extra* libavfilter-extra*
if [ -f ../hold.lock ]; then
    cat ../hold.lock | xargs apt unhold
fi
sudo dpkg -i *.deb
ls *.deb | cut -d_ -f1 > ../hold.lock
cat ../hold.lock | xargs apt hold
cd -