The majority of these files depicted penetrative sexual activity between adults and children, the court heard.
Crown prosecutor Hayley Sheridan argued that given the materials found and distributed, of which most showed children being violated, home detention was out of the question.
Sheridan submitted that a starting point of seven years' prison was warranted, before allowing discounts for Parkinson's guilty pleas, remorse, and any mitigating factors.
Lawyer Tony Balme argued for a lesser sentence given his client had no prior convictions, the limited period of offending, and Parkinson's "lack of intent" in terms of the distribution charges.
Balme urged Judge Ingram to take into account that Parkinson had not knowingly intended to share the video files he downloaded with other people because it was an automatic feature of the computer software programme used.
He said no one could say with certainty how many people these files had been distributed to.
Judge Ingram agreed he could distinguish Parkinson's offending from those who actively shared these sorts of files with others after logging into chat rooms and the like.
The judge also took into account Parkinson's prior unblemished record, remorse, and the rehabilitative steps he had taken. But Judge Ingram said given this offending related to possessing and sharing "many of the worst kinds of objectionable publications", a strong deterrent sentence was justified.
"This was premeditated behaviour and I'm satisfied on the [legal] authorities that a sentence of imprisonment and nothing less is appropriate given all the circumstances."