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avfvideosrc: Use unique-id property to select camera sources

Jan Lorenz requested to merge jlorenz/gstreamer:avfvideosrc_introduce_unique_id into main

Using device-index to select anything other than a screen source is unstable on modern macOS systems, so to correctly select a camera, unique-id should be used.

This changes the following things:

  • it introduces a new unique-id property to avfvideosrc
  • It introduces some validation, if the capture-screen property is true, using device-index results in an error, and vice versa.
  • avfdeviceprovider generates launch lines using unique-id instead of device-index

Fixes: #1761

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