Plex DVR File Rename on FFMPEG Encoding - bash

Question

I'm currently using a bash shell script to encode all of my Plex DVR recordings to H.264 using FFMPEG. I'm using this little for loop I found online to encode all of the files in a single directory:
for i in *.ts;
do echo "$i" && ffmpeg -i "$i" -vf yadif -c:v libx264 -preset veryslow -crf 22 -y "/mnt/d/Video/DVR Stash/Seinfeld/${i%.*}.mp4";
done
This has served its purposes well but in the process I would like to rename the file to my preferred naming convention so that the original filename Seinfeld (1989) - S01E01 - Pilot.ts is renamed to Seinfeld S01 E01 Pilot.mp4 in the encoded file. While I am already using a regular expression to change the .ts extension to .mp4, but I'm no expert with regex, especially in the bash shell so any help would be appreciated.
For anyone that's interested in my Plex setup, I'm using an old machine running Linux Mint as my dedicated DVR and actually accessing it over the network with my daily driver which is a gaming machine, so more processing power for video encodes. While that one is a Windows machine, I'm using the Ubuntu bash under WSL2 to run my script, as I prefer it over the Windows command prompt or Powershell (my day job is a web developer on a company issued Mac). So here's a sample of my code for anyone that might consider doing something similar.
if [[ -d "/mnt/sambashare/Seinfeld (1989)" ]]
then
cd "/mnt/sambashare/Seinfeld (1989)"
echo "Seinfeld"
for dir in */; do
echo "$dir/"
cd "$dir"
for i in *.ts;
do echo "$i" && ffmpeg -i "$i" -vf yadif -c:v libx264 -preset veryslow -crf 22 -y "/mnt/d/Video/DVR Stash/Seinfeld/${i%.*}.mp4";
done
cd ..
done
fi
While I've considered doing a for loop for all shows, for now I am doing each show like this individually as there are a few shows I have custom encoding settings for

Answer 1

A small revision from your code, something like this, with extglob
#!/usr/bin/env bash
if [[ -d "/mnt/sambashare/Seinfeld (1989)" ]]; then
cd "/mnt/sambashare/Seinfeld (1989)" || exit
echo "Seinfeld"
for dir in */; do
echo "$dir/"
cd "$dir" || exit
for i in *.ts; do
shopt -s extglob
new_file=${i//#( \(*\)|- )}
new_file=${new_file/E/ E}
new_file=${new_file%.*}
echo "$i" &&
ffmpeg -i "$i" -vf yadif -c:v libx264 -preset veryslow -crf 22 -y "/mnt/d/Video/DVR Stash/Seinfeld/${new_file}.mp4"
shopt -u extglob
done
cd ..
done
fi
The string/glob/pattern slicing might fail if there is/are E's in the file name somewhere besides the episode.
With BASH_REMATCH using the =~ operator for Extended Regular Expression. This will work even if there are more E's in the filename.
#!/usr/bin/env bash
if [[ -d "/mnt/sambashare/Seinfeld (1989)" ]]; then
cd "/mnt/sambashare/Seinfeld (1989)" || exit
echo "Seinfeld"
for dir in */; do
echo "$dir/"
cd "$dir" || exit
for i in *.ts; do
regex='^(.+) (\(.+\)) - (S[[:digit:]]+)(E[[:digit:]]+) - (.+)([.].+)$'
[[ $i =~ $regex ]] &&
new_file="${BASH_REMATCH[1]} ${BASH_REMATCH[3]} ${BASH_REMATCH[4]} ${BASH_REMATCH[5]}"
echo "$i" &&
ffmpeg -i "$i" -vf yadif -c:v libx264 -preset veryslow -crf 22 -y "/mnt/d/Video/DVR Stash/Seinfeld/${new_file}.mp4"
done
cd ..
done
fi
Added a cd ... || exit just to make sure that the script stops/exits if there is/are errors when trying to cd to somewhere and not to continue the script.