Seeking script to add to the automator service to make it reveal newly created item in finder

You can simply pass the selected folder to the shell script by selecting "as argument" from the "pass input:" dropdown-menu and then adding "$@" at the point in your script where you want the folder path to be used.

To use drag&drop, just remove the "ask for finder items" action and let the "run shell script" receive the input from "application can receive files and folders as input".

Let's start with a small example.

Fire up Automator and create a service with a single "Run Shell Script" step.

Set it to take Folders as input from Finder

Pass input as arguments. Shell is /bin/bash

Bash code:

cd "$@"

for file in *.mov *.flk *.mp4
    do
    ls -1 "$file" >> ~/Desktop/test_file_awk.txt
done

What this does it takes the directory you pass in as "$@" and goes into it then runs the command on all the files in that directory.

"$@" is in quotes to protect against spaces, as is "$file"

So, you can replicate this to your setup:

cd "$@"
i=$(for file in {*.flv,*.mov,*.mp4,*.m4v}
    do 
    /usr/local/bin/mediainfo "--Inform=Video;%Duration%" "$file"
done | awk '{total+=$0}END{print total}')

((i/=1000, sec=i%60, i/=60, min=i%60, hrs=i/60))
timestamp=$(printf "%dh%02dm%02ds" $hrs $min $sec)
echo -e "Total duration of video files in this folder:\n\n$timestamp" > _total_duration.txt

Personally, I would change the output to something like:

> ~/Desktop/"$@"_total_duration.txt

So that the data ends up on your desktop in a file named for the folder, but I have a lot of media directories and I don't want txt files in them.