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urisourcebin: Handle legacy pad replacements from parsebin

Edward Hervey requested to merge bilboed/gstreamer:urisourcebin-chains into main

When dealing with demuxers which aren't streams-aware, we need to handle the old-school "stream replacement" dance from parsebin and hide that in such a way that output pads are re-used (if compatible).

By analyzing the collection posted by parsebin, we can:

  • Identify whether some output slots are no longer used (because the stream they currently handle is not present in the collection)
  • Decide if some upcoming streams could re-use the existing slot

This supports both buffering and non-buffering modes.

Fixes #1651 (closed)

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