Topics covered in this article:
- Potential issues with deliverables
- Tools and solutions for quality control
- Checking Dolby Vision metadata
- Checking Dolby Vision masters
The final Dolby Vision master files and deliverables should ideally be checked for quality and integrity before they can be finally delivered to the studio or the client. There are a variety of potential issues that could arise with the final deliverables, especially since the Dolby Vision metadata must be correctly matched with the image/video component.
There are various products and solutions from Dolby’s partners that can be used to check the deliverables before final delivery.
There are two principal steps that must be carried out as part of the QC of a Dolby Vision master.
Step 1: Check Dolby Vision Metadata
Metafier, a tool that is part of the Dolby Vision Professional Tools, can be used to check the Dolby Vision metadata that is exported as an XML or embedded in the video essence of an MXF or IMF and confirm its validity and integrity. Any errors that are spotted this way can be corrected, and any required changes to the XML for versioning and delivering to a studio specification can also be made using Metafier.
Step 2: Check the Dolby Vision Master (Image/Video + Metadata)
The Dolby Vision master including the image/video and the metadata must be checked together to ensure that they work well together and as expected. This can be done by taking the two components into a system like Resolve, Transkoder, Cortex, etc. and generating a mapped deliverable at any target and visually checking the result. Such a mapped deliverable can either be generated by rendering or by reviewing in real time using the CMU. Any flaws in the image and color can be traced back to either the PQ-encoded HDR master or the metadata.
If the visual check passes without any issues, it can be concluded that the individual components are in order and can be delivered without concern.
If, on the other hand, there are errors or flaws found in the derived versions, the sources will have to be examined and the faults traced back to their origins and corrected.