QOS on nvcompositor, nvv4l2h264enc, nvv4l2decoder

There is qos flag in properties of nvmcompositor/nvv4l2h264enc/nvv4l2decoder element. If it is enabled, it will handle QOS event.
How do those elements handle QOS event?
Default of this property is false, when should I enable?
Any drawback if I always enable?

It is a mechanism in gstreamer frameworks: Quality Of Service (QoS)

By default it is disabled and we don’t test the use-case that it is enabled. You may give it a try but it is possible it does not work properly.

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