The script sources a libffmpeg.so that supports "proprietary media" for use on Linux distros running Vivaldi 4.2+ on x86_64/amd64

chromium-ffmpeg-snap.sh

#!/bin/sh -eu

# This script fetches the chromium-ffmpeg snap package and extracts a suitable
# libffmpeg.so with proprietary media support. 

# x86_64 (amd64) chromium-ffmpeg snap from 2021-09-02T21:00:25.927144+00:00
SNAP_NAME=XXzVIXswXKHqlUATPqGCj2w2l7BxosS8_23.snap

# Fetch the snap if not already present
if [ ! -e $SNAP_NAME ]; then
  if command -v wget >/dev/null 2>&1; then
    DL='wget -O-'
  elif command -v curl >/dev/null 2>&1; then
    DL='curl -L'
  else
    echo 'Install Wget or cURL first' >&2; exit 1
  fi
  $DL https://api.snapcraft.io/api/v1/snaps/download/$SNAP_NAME > $SNAP_NAME
fi

# Extract libffmpeg.so for Vivaldi 4.2 and 4.3
tail -c+97 $SNAP_NAME | xz -d | head -c19451350 > libffmpeg.so.4.2
tail -c+97 $SNAP_NAME | xz -d | tail -c+19451351 | head -c19448325 > libffmpeg.so.4.3

# Check libs are as expected
cat <<EOF | md5sum -c
42e4b8dac1913ff16f12d2779f0c2b72  libffmpeg.so.4.2
8fd8dbce1487ca71db3f7bb14f770eec  libffmpeg.so.4.3
EOF

# Inform the user how to proceed
cat <<EOF

Copy a suitable libffmpeg.so.X.X to your install directory (X.X = Vivaldi version), e.g:

    sudo mv libffmpeg.so.4.2 /opt/vivaldi

EOF