Enable H.264 codec support for Opera browser

## opera_x264_support.sh
#!/bin/bash

# Source:
# https://forums.opera.com/topic/34659/opera-linux-browser-h-264-support-through-x264-open-source-codec

# Tested on:
# Ubuntu 18.04.3 LTS (x86_64; ubuntu:GNOME)
# Opera 62.0.3331.116
#       63.0.3368.66

# retrieve latest ffmpeg release version
URL=`curl https://github.com/iteufel/nwjs-ffmpeg-prebuilt/releases/latest`
FFMPEGVER=${URL%\"*}
FFMPEGVER=${FFMPEGVER##*/}
FFMPEGZIP=${FFMPEGVER}-linux-x64.zip

# download library
curl -L -O https://github.com/iteufel/nwjs-ffmpeg-prebuilt/releases/download/${FFMPEGVER}/${FFMPEGZIP}
unzip ${FFMPEGZIP}
rm ${FFMPEGZIP}

# overwrite opera libffmpeg
sudo mv libffmpeg.so /usr/lib/x86_64-linux-gnu/libffmpeg_h264.so
sudo mv /usr/lib/x86_64-linux-gnu/opera/libffmpeg.so /usr/lib/x86_64-linux-gnu/opera/libffmpeg.so.orig
sudo ln -s /usr/lib/x86_64-linux-gnu/libffmpeg_h264.so /usr/lib/x86_64-linux-gnu/opera/libffmpeg.so