Adding episode start timestamps to multi episode files

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Highly recommend Mkvtoolnix. Syntax is super easy and can be done by timestamps or by chapters if your media has it. Even has replacement logic for episode numbers which I tend to wrap in a reversed for loop (start at the end of your file set) since you'll always get a counter starting at 1 for episode numbers (e.g., "%02d" would yield zero-padded episode numbers starting at 1). For loop can rename and avoid overwrites if started in reverse order.