a version of Livepeer's install_ffmpeg.sh that builds with SRT support

install_ffmpeg.sh

#!/usr/bin/env bash

set -ex

# Windows (MSYS2) needs a few tweaks
if [[ $(uname) == *"MSYS2_NT"* ]]; then
  export PATH="$PATH:/usr/bin:/mingw64/bin"
  export C_INCLUDE_PATH="${C_INCLUDE_PATH:-}:/msys64/mingw64/lib"
  export HOME="/build"
  mkdir -p $HOME

  export PATH="$HOME/compiled/bin":$PATH
  export PKG_CONFIG_PATH=/mingw64/lib/pkgconfig

  export TARGET_OS="--target-os=mingw64"
  export HOST_OS="--host=x86_64-w64-mingw32"

  # Needed for mbedtls
  export WINDOWS_BUILD=1
fi

export PATH="$HOME/compiled/bin":$PATH
export PKG_CONFIG_PATH="${PKG_CONFIG_PATH:-}:$HOME/compiled/lib/pkgconfig"

# NVENC only works on Windows/Linux
if [ $(uname) != "Darwin" ]; then
  if [ ! -e "$HOME/nv-codec-headers" ]; then
    git clone https://git.videolan.org/git/ffmpeg/nv-codec-headers.git "$HOME/nv-codec-headers"
    cd $HOME/nv-codec-headers
    make -e PREFIX="$HOME/compiled"
    make install -e PREFIX="$HOME/compiled"
  fi
fi

if [ ! -e "$HOME/nasm/nasm" ]; then
  # sudo apt-get -y install asciidoc xmlto # this fails :(
  git clone -b nasm-2.14.02 https://repo.or.cz/nasm.git "$HOME/nasm"
  cd "$HOME/nasm"
  ./autogen.sh
  ./configure --prefix="$HOME/compiled"
  make
  make install || echo "Installing docs fails but should be OK otherwise"
fi

if [ ! -e "$HOME/x264" ]; then
  git clone http://git.videolan.org/git/x264.git "$HOME/x264"
  cd "$HOME/x264"
  # git master as of this writing
  git checkout 545de2ffec6ae9a80738de1b2c8cf820249a2530
  ./configure --prefix="$HOME/compiled" --enable-pic --enable-static ${HOST_OS:-} --disable-cli
  make
  make install-lib-static
fi

EXTRA_FFMPEG_FLAGS=""
# Only Linux supports CUDA... for now.
if [ $(uname) == "Linux" ]; then
  if [ -e /usr/local/cuda/include ]; then
    echo "CUDA detected, building with GPU support"
    EXTRA_FFMPEG_FLAGS="--enable-cuda --enable-cuvid --enable-nvenc --enable-filter=scale_cuda --enable-encoder=h264_nvenc --enable-cuda-nvcc"
  fi
fi

if [ ! -e "$HOME/srt" ]; then
  git clone --depth=1 https://github.com/Haivision/srt.git "$HOME/srt"
  cd "$HOME/srt"
  # git master as of this writing
  ./configure --prefix="$HOME/compiled"
  make
  make install
fi

# if [ ! -e "$HOME/ffmpeg/libavcodec/libavcodec.a" ]; then
  # git clone --depth=1 https://git.ffmpeg.org/ffmpeg.git "$HOME/ffmpeg" || echo "FFmpeg dir already exists"
  cd "$HOME/ffmpeg"
  # git checkout 4cfc34d9a8bffe4a1dd53187a3e0f25f34023a09
  ./configure ${TARGET_OS:-} --disable-doc --disable-sdl2 --disable-iconv \
    --disable-muxers --disable-demuxers --disable-parsers --disable-protocols \
    --disable-encoders --disable-decoders --disable-filters --disable-bsfs \
    --disable-postproc --disable-lzma \
    --enable-gnutls --enable-libx264 --enable-gpl --enable-nonfree \
    --enable-libsrt \
    --enable-protocol=https,rtmp,file,libsrt \
    --enable-muxer=mpegts,hls,segment --enable-demuxer=flv,mpegts \
    --enable-bsf=h264_mp4toannexb,aac_adtstoasc,h264_metadata,h264_redundant_pps \
    --enable-parser=aac,aac_latm,h264 \
    --enable-filter=abuffer,buffer,abuffersink,buffersink,afifo,fifo,aformat \
    --enable-filter=aresample,asetnsamples,fps,scale \
    --enable-encoder=aac,libx264 \
    --enable-demuxer=mov \
    --enable-decoder=aac,h264 \
    --extra-cflags="-I${HOME}/compiled/include" \
    --extra-ldflags="-L${HOME}/compiled/lib" \
    --prefix="$HOME/compiled" \
    $EXTRA_FFMPEG_FLAGS
  make
  make install
# fi