Support VFR videos (#141)

[brosenberg42]

Merges https://github.com/openmpf/openmpf-docker/pull/141 in to develop

Issue: https://github.com/openmpf/openmpf/issues/1307

Associated PRs:

• https://github.com/openmpf/openmpf/pull/1314
• https://github.com/openmpf/openmpf-python-component-sdk/pull/47
• https://github.com/openmpf/openmpf-cpp-component-sdk/pull/104
• https://github.com/openmpf/openmpf-docker/pull/143

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This change is