My treadmill and my garmin are completely uncalibrated and the only measurements I have for indoor running are time / HR

I have a video I made of an outdoor 5k at a leisurely pace I put on TV while I ran on the treadmill, and the three displayed the following distances at about 25min:

Video: 3.2km
Treadmill: 2.6km
Garmin: 2.1km

I hate this with all my heart. All I want are metrics that make sense.

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