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That is, my brother's version of Farewell My Concubine has a 164min version. What's the difference between it and the 17 1min version?
It's all the full version. The duration is different. It's the frame rate

The frame rate of 17 1min is 23.976fps.

164min frame rate is 25fps.

So (171* 23.976)/25 =164.

Give a simple example.

A video consists of 6000 frames.

If you run 24 frames a second, the time is 250s s.

If you run 25 frames a second, the time is 240s s.

If you run 60 frames a second, the time is only 100s.