build-ffmpeg-nvenc.sh

#!/bin/bash -eu

# Builds ffmpeg with nvenc for private use.
# Fetches main sources (ffmpeg, nvidia headers) for you.
# Uses autodetect to include extra media libraries already on your system;
# this doesn't download and compile the universe like other scripts.

# To use, place this script in its own directory and run it.
# The ffmpeg version can be changed below.

########## CONFIG ##########
ffmpegVersion="n4.2.4"
############################

# workspace
ffmpeg="ffmpeg-${ffmpegVersion}"
rm -rf build
build="${PWD}/build"
include="${build}/include"
lib="${build}/lib"

# check build tools
for tool in cmake git yasm; do
    (hash $tool 2>/dev/null) || (echo "Missing: ${tool}"; exit 1)
done

# install headers and pkgconfig locally. the sdk isn't needed. from nvidia's own docs:
#   FFmpeg maintains a version of NVIDIA Video Codec SDK headers in a separate git repository, for ease of compilation.
#   As such the download of NVIDIA Video Codec SDK is not essential for building FFmpeg.
if [ ! -d nv-codec-headers ]; then
    echo "Fetching nv-codec-headers ..."
    git clone -q --single-branch --depth 1 https://git.videolan.org/git/ffmpeg/nv-codec-headers.git
fi
cd nv-codec-headers
git pull -q
make install PREFIX="${build}"
cd ..

# compile ffmpeg
if [ ! -d $ffmpeg ]; then
    echo "Fetching ${ffmpeg} ..."
    git clone -q -b $ffmpegVersion --single-branch --depth 1 https://git.ffmpeg.org/ffmpeg.git $ffmpeg
fi
cd $ffmpeg
PKG_CONFIG_PATH="${lib}/pkgconfig" ./configure \
    --prefix="${build}" \
    --extra-cflags="-m64 -I${include}" \
    --extra-ldflags="-L${lib}" \
    --enable-gpl \
    --enable-nonfree \
    --enable-nvenc \
    --enable-version3 \
    --disable-doc \
    --disable-ffplay \
    --disable-ffprobe \
    "$@"
make -j$(nproc) ffmpeg install
cd ..

echo
echo "Success."
echo
file build/bin/ffmpeg
echo