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transcriberbin: Add caption-source property

Seungha Yang requested to merge seungha.yang/gst-plugins-rs:caption-source-prop into main

By using this new property, application can select exclusive caption source. There are three source types

  • Both: Inband and transcription captions are combined if exist. This is default behavior.
  • Inband: Transcription buffers will be dropped
  • Transcription: Caption meta of each video buffer will be dropped

In this version, transcriberbin doesn't provide any hint for application to help caption source decision. That can be done by application's strategy, passthrough status or probing inband caption meta for example.

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