Replace libffmpeg.so of opera version 54.0.2952.71 by the bundled file from opera version 68.0.3618.173

opera-get-ffmpeg-from-68.sh

#! /bin/bash

rm -fr opera-get-ffmpeg-from-68.sh.tmp

TAB="	"

cat <<EOF
This script safely replaces the file libffmpeg.so from opera version

${TAB}54.0.2952.71

by the updated file from version

${TAB}68.0.3618.173

The old file is renamed to libffmpeg.so-..., with ... being the md5sum of
it's content, so in case something goes wrong you can easily revert.

This script tries to replaces the file in these directories:

EOF

# Configure all directories to search for libffmpeg.so:
opera_dirs=(
	"/usr/lib64/opera"
)

# Configure all md5sums of old libffmpeg.so files we're going to replace
md5sums=(
	"19915d948247726293aa1cf8a0bc4a2d" # 54.0.2952.71
)

# Leave this empty, it will be populated by the following loop
replace_dirs=(
)

for opera_dir in "${opera_dirs[@]}"
do
	echo -n "${TAB}$opera_dir"
	if test -f "$opera_dir/libffmpeg.so"
	then
		if echo "c8f82cf09326b47d03ee6b8c7e3f163c  $opera_dir/libffmpeg.so" | md5sum -c - >/dev/null 2>&1
		then
			echo " -> already version 68.0.3618.173"
		else
			ok=false
			for md5sum in "${md5sums[@]}"
			do
				if echo "$md5sum  $opera_dir/libffmpeg.so" | md5sum -c - >/dev/null 2>&1
				then
					ok=true
				fi
			done
			
			if $ok
			then
				echo " -> will be replaced"
				replace_dirs+=("$opera_dir")
			else
				echo -n " -> checksum failure, "
				ok=false
				for arg in "$@"
				do
					if test "X$arg" == "X--force=$opera_dir"
					then
						echo "will be replaced anyways (forced by command line)"
						ok=true
					fi
				done
				if ! $ok
				then
					echo "will be skipped (force by command line --force=$opera_dir)"
				fi
			fi
		fi
	else
		echo " -> no libffmpeg.so found"
	fi
done

(
	if ! test -d ../opera-get-ffmpeg-from-68.sh.tmp
	then
		mkdir opera-get-ffmpeg-from-68.sh.tmp || exit 2
		cd opera-get-ffmpeg-from-68.sh.tmp || exit 2
	fi

	if test 0 -eq "${#replace_dirs[@]}"
	then
		echo
		echo "I couldn't identify any libffmpeg.so file to replace."
		exit 1
	fi

	wget http://deb.opera.com/opera-stable/pool/non-free/o/opera-stable/opera-stable_68.0.3618.173_amd64.deb || exit 2

	ar x opera-stable_68.0.3618.173_amd64.deb || exit 2

	xz -cd data.tar.xz | tar x ./usr/lib/x86_64-linux-gnu/opera/libffmpeg.so || exit 2

	echo "c8f82cf09326b47d03ee6b8c7e3f163c  usr/lib/x86_64-linux-gnu/opera/libffmpeg.so" | md5sum -c - || exit 2

	for replace in "${replace_dirs[@]}"
	do
		echo -n "Replacing $replace"
		md5sum="$(md5sum "$replace/libffmpeg.so" | awk '{ print $1 }')"
		if test -f "$replace/libffmpeg.so.$md5sum"
		then
			echo " -> old file *.$md5sum exists, "
			if ! cmp "$replace/libffmpeg.so" "$replace/libffmpeg.so.$md5sum" >/dev/null
			then
				rm -i "$replace/libffmpeg.so" || continue
				echo "same content, skipping backup"
			else
				echo "different content, can't save old version, skipping"
				continue
			fi
		else
			echo -n " -> backing up old file as *.$md5sum"
			mv -i "$replace/libffmpeg.so" "$replace/libffmpeg.so.$md5sum" || continue
		fi
		if cp -ip usr/lib/x86_64-linux-gnu/opera/libffmpeg.so "$replace/libffmpeg.so"
		then
			echo " -> update done"
		fi
	done
)

rm -fr opera-get-ffmpeg-from-68.sh.tmp