ffmpeg gpu support

gistfile1.txt

origin	https://git.videolan.org/git/ffmpeg/nv-codec-headers.git 
# tag n10.0.26.0

# may be useful to point ffmpeg to different path, eg. conda
# --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu

base=/home/gridsan/omoll/
mkdir ${base}/ffmpeg_install
prefix=${base}/ffmpeg_install
nv_codec_install=${base}/nv-codec-headers-install/

./configure --enable-cuvid --enable-nvdec --enable-nvenc --enable-libnpp \
--enable-libx264 --enable-libx265 --enable-libvpx --enable-libwebp --enable-libopenjpeg \
--enable-libfreetype --enable-libfontconfig --enable-libfribidi \
--enable-nonfree --enable-gpl \
--enable-libssh --enable-openssl \
--enable-zlib --enable-libmp3lame \
--extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 \
--prefix=$prefix \
--extra-cflags=-I"${nv_codec_install}/include/" \
--extra-cflags=-I"${prefix}/include/"  --extra-ldflags=-L"${prefix}/lib/" \
--disable-doc --enable-hardcoded-tables --enable-pic --enable-pthreads --enable-shared --disable-stripping


PATH=${local_build}/bin PKG_CONFIG_PATH=${local_build}/include/ ./configure --enable-cuvid --enable-nvdec --enable-nvenc --enable-libnpp \
--enable-libx264  \
--enable-libfreetype --enable-libfontconfig \
--enable-nonfree --enable-gpl \
--enable-openssl \
--enable-zlib --enable-libmp3lame \
--extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 \
--prefix=$prefix \
--extra-cflags=-I"${local_build}/include/" \
--extra-ldflags=-L"${local_build}/lib/" \
--disable-doc --enable-hardcoded-tables --enable-pic --enable-pthreads --enable-shared --disable-stripping

## example loading and rescaling using npp
file=myfile.mp4
target_height=800
device=0
export LD_LIBRARY_PATH=./lib/ 

## test with no output
./bin/ffmpeg_gpu -vsync 0 -hwaccel nvdec -hwaccel_device $device -c:v h264_cuvid -i $file \
 -vf hwupload_cuda,scale_npp=-1:$target_height:interp_algo=super -f null out
 
 ## output to a file
./bin/ffmpeg_gpu -vsync 0 -hwaccel nvdec -hwaccel_device $device -c:v h264_cuvid -i $file \
-vf hwupload_cuda,scale_npp=-1:$target_height:interp_algo=super -c:v h264_nvenc ../output.mp4

# if want to build other stuff manually
# check https://gist.github.com/Brainiarc7/3f7695ac2a0905b05c5b

# some explanation of gpu options, such as rescaling:
# https://developer.nvidia.com/blog/nvidia-ffmpeg-transcoding-guide/