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fmp4mux: allow targeting a minimum fragment duration

Mathieu Duponchelle requested to merge meh/gst-plugins-rs:fmp4mux-minimum-fragment-duration into main

Use case:

  • We know maximum keyframe interval from input stream (eg 2 seconds)
  • We want to target a minimum fragment duration (eg 5 seconds)

We can thus use latency 2 seconds, and ensure that we always have enough time to prepare 6 seconds fragments, but we also don't need to set fragment-duration to 7 seconds to achieve that.

That means that if we actually get one keyframe per second from the input stream, we can output the optimal 5-second duration fragments.

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