Units of the 'processed' and 'dropped' fields. Video sinks and video filters will use GST_FORMAT_BUFFERS (frames). Audio sinks and audio filters will likely use GST_FORMAT_DEFAULT (samples).
Total number of units correctly processed since the last state change to READY or a flushing operation.
Total number of units dropped since the last state change to READY or a flushing operation.
Set the QoS stats representing the history of the current continuous pipeline playback period. When format is GST_FORMAT_UNDEFINED both dropped and processed are invalid. Values of -1 for either processed or dropped mean unknown values. MT safe.