base classes : Avoid posting latency message if nothing changed
From !3282 (merged)
The same should probably also be done for audioencoder/decoder, videoencoder, baseparse, aggregator and appsrc while we're at it :)
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From !3282 (merged)
The same should probably also be done for audioencoder/decoder, videoencoder, baseparse, aggregator and appsrc while we're at it :)