I need to retranscode all of the game movie file to be able to view it. Related to the Proton GE version, I also tried to run using newer version(7-43 and 8-4) but there seems to be a regression causing some stuttering in newer version

Script that I used (run this inside the game data folder)

#!/bin/bash

# Iterate through .dat files in the folder
for file in ./*.dat; do
    if [ -f "$file" ]; then
        echo "running for ${file}"
        # Backup the file
        cp "$file" "${file}.bck"

        # Run ffmpeg command
        ffmpeg -i "$file" -vcodec libtheora -qscale:v 8 -acodec libopus "${file}.mkv"
        
        mv "${file}.mkv" "${file}"
    fi
done