[centos-7] Enable Nvidia hardware encoding in FFmpeg

centos-7/Dockerfile

@@ -71,10 +71,15 @@ RUN version=4.2.1 && \
     yum clean all && \
     source /etc/profile && \
     cd /tmp && \
+    git clone https://git.videolan.org/git/ffmpeg/nv-codec-headers.git && \
+    cd nv-codec-headers && \
+    make install && \
+    cd .. && \
+    rm -rf nv-codec-headers && \
     curl -sSLO http://ffmpeg.org/releases/ffmpeg-${version}.tar.gz && \
     tar -xf ffmpeg-${version}.tar.gz && \
     cd ffmpeg-${version} && \
-    ./configure --prefix=/usr/local --enable-gpl --enable-libfreetype --enable-avresample --enable-shared --disable-static --enable-pic && \
+    ./configure --prefix=/usr/local --enable-gpl --enable-nvenc --enable-libfreetype --enable-avresample --enable-shared --disable-static --enable-pic && \
     make install && \
     cd .. && \
     rm -rf ffmpeg-${version}*

centos-7/bash/toolchain.sh

@@ -3,3 +3,5 @@ source scl_source enable devtoolset-8
 
 # Git 2.18
 source scl_source enable rh-git218
+
+export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:/usr/lib/pkgconfig:/usr/local/lib/pkgconfig"