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QC Layers

QC Items apply to one or more layers:


Tests the structure/integrity of the file wrapper, or of the metadata within the wrapper.


Tests the structure/integrity of the encoded bitstream, or of the metadata within the bitstream.


A test applied to the decoded essence – the video frames or audio samples.

X-check ("Crosscheck")

A verification that the values agree between multiple layers. For example, if a baseband test of video frame size has been completed, and the video frame size metadata in the format and wrapper have been examined, the X-check will verify that all values match.

Programme layout

Programme layout Items look for specific audio, video or audio-visual patterns or types that are located at specific time intervals. For example a programme may be required to contain 10 seconds of colour bars and tone followed by black and silence, then the programme content, followed by 5 seconds of black and silence.


Version by Frans De Jong - March 23, 2023, 2:52 p.m.