FWIW, here was my experience with trying to compile ffmpeg from source when I had to try it recently.
General ffmpeg
compilation guidelines came from https://trac.ffmpeg.org/wiki/CompilationGuide/Centos
Enhanced with infos from https://developer.nvidia.com/ffmpeg for NVENC support and also https://www.linode.com/docs/platform/linode-gpu/getting-started-with-gpu/ for CUDA toolkit installation help.
For initial compilation, I believe you need to downgrade to CUDA toolkit 10.1 (at least as of 2020-04-08), download from https://developer.nvidia.com/cuda-toolkit-archive - go to the download page and use the instructions when selecting Linux/x84_64/CentOS/8/runfile (local)
to install. But then for running ffmpeg you'll need to upgrade back to 10.2 (or at least upgrade the driver, I didn't try this though), otherwise when encoding using NVENC you'll get an error like:
[h264_nvenc @ 0x41d4080] Driver does not support the required nvenc API version. Required: 9.1 Found: 9.0
[h264_nvenc @ 0x41d4080] The minimum required Nvidia driver for nvenc is 435.21 or newer
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Install dependencies (some of these are already there)
sudo yum install autoconf automake bzip2 bzip2-devel cmake \
freetype-devel gcc gcc-c++ git libtool make mercurial pkgconfig zlib-devel
mkdir ~/ffmpeg_sources
NASM
cd ~/ffmpeg_sources && \
curl -O -L https://www.nasm.us/pub/nasm/releasebuilds/2.14.02/nasm-2.14.02.tar.bz2 && \
tar xjvf nasm-2.14.02.tar.bz2 && \
cd nasm-2.14.02 && \
./autogen.sh && \
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" && \
make && \
make install
YASM
cd ~/ffmpeg_sources && \
curl -O -L https://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz && \
tar xzvf yasm-1.3.0.tar.gz && \
cd yasm-1.3.0 && \
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" && \
make && \
make install
NV Codec headers, required for NVENC
cd ~/ffmpeg_sources && \
git clone https://git.videolan.org/git/ffmpeg/nv-codec-headers.git && \
cd nv-codec-headers && \
sudo make install
libx264
cd ~/ffmpeg_sources && \
git clone --depth 1 https://code.videolan.org/videolan/x264.git && \
cd x264 && \
PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --enable-static && \
make && \
make install
libx265
cd ~/ffmpeg_sources &&
hg clone https://bitbucket.org/multicoreware/x265 && \
cd ~/ffmpeg_sources/x265/build/linux && \
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED:bool=off ../../source && \
make && \
make install
libfdk_aac
cd ~/ffmpeg_sources && \
git clone --depth 1 https://github.com/mstorsjo/fdk-aac && \
cd fdk-aac && \
autoreconf -fiv && \
./configure --prefix="$HOME/ffmpeg_build" --disable-shared && \
make && \
make install
#libmp3lame
cd ~/ffmpeg_sources && \
curl -O -L https://downloads.sourceforge.net/project/lame/lame/3.100/lame-3.100.tar.gz && \
tar xzvf lame-3.100.tar.gz && \
cd lame-3.100 && \
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --disable-shared --enable-nasm && \
make && \
make install
libopus
cd ~/ffmpeg_sources && \
curl -O -L https://archive.mozilla.org/pub/opus/opus-1.3.1.tar.gz && \
tar xzvf opus-1.3.1.tar.gz && \
cd opus-1.3.1 && \
./configure --prefix="$HOME/ffmpeg_build" --disable-shared && \
make && \
make install
libvpx
cd ~/ffmpeg_sources && \
git clone --depth 1 https://chromium.googlesource.com/webm/libvpx.git && \
cd libvpx && \
./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests --enable-vp9-highbitdepth --as=yasm && \
make && \
make install
ffmpeg itself
cd ~/ffmpeg_sources && \
curl -O -L https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \
tar xjvf ffmpeg-snapshot.tar.bz2 && \
cd ffmpeg && \
# Extra pkgconfig path comes from https://superuser.com/questions/1299064/error-cuvid-requested-but-not-all-dependencies-are-satisfied-cuda-ffnvcodec \
PATH="$HOME/bin:$PATH" \
PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig:/usr/local/lib/pkgconfig/" \
./configure \
--prefix="$HOME/ffmpeg_build" \
--pkg-config-flags="--static" \
--extra-libs=-lpthread \
--extra-libs=-lm \
--bindir="$HOME/bin" \
--enable-gpl \
--enable-libfdk_aac \
--enable-libfreetype \
--enable-libmp3lame \
--enable-libopus \
--enable-libvpx \
--enable-libx264 \
--enable-libx265 \
--enable-nonfree \
--enable-libfdk_aac \
--enable-libmp3lame \
--enable-libopus \
--enable-libvpx \
--enable-cuda-nvcc \
--enable-cuvid \
--enable-nvenc \
--enable-libnpp \
--extra-cflags="-I$HOME/ffmpeg_build/include -I/usr/local/cuda/include" \
--extra-ldflags="-L$HOME/ffmpeg_build/lib -L/usr/local/cuda/lib64" && \
make -j 10 && \
make install && \
hash -d ./ffmpeg