Inaccurate frame rate reporting for `60000/1001` content

[dio-az]

For 60000/1001 frame rate content, the reported frame rate is inaccurate: HLS reports as 59.92, and DASH reports as 45000/751, instead of the expected 59.94 and 60000/1001.

The root cause is most probably rounding when the frame duration is rescaled to the 90000 timescale, which cannot represent the 60000/1001 rate exactly.

Expected Behavior

A 60000/1001 source is reported as 59.94 for HLS and 60000/1001 for DASH.

Actual Behavior

The frame rate is reported as 59.92 in HLS and 45000/751 in DASH.

Steps to Reproduce

• Serve a 60000/1001 source (e.g. Meridian) via HLS and DASH.
• Inspect the reported frame rate in the manifest.
• Observe 59.92 instead of the expected 59.94, and 45000/751 instead of the expected 60000/1001.