For Netflix productions, metadata can be delivered one of 2 ways:
- Separate XML Sidecar metadata file
- Embedded in the Video MXF of an IMF Package - can be viewed by two methods:
- using clip inspector in supported software (i.e. Colorfront TransKoder)
- extracting the metadata via Dolby CM Offline
Level 1 (Image character analysis) - required for ALL shots
- Default color mapping will be applied based on Dolby’s analysis values.
Level 2 <TID 1> (SDR Trim Pass values) - not required for every shot
- Will be included only if creative talent decides additional color adjustments need to be made on a scene-by-scene basis.
Common QC Issues
Issue: Some software versions are unable to register the metadata for use in creating an SDR pass or read metadata embedded in an MXF in IMPs for display.
Example: Current Colorfront versions can not utilize DoVi Metadata or view metadata in its clip inspector on IMPs generated by some versions of Clipster)
Best Practice: To examine the Dolby Vision metadata, extract it via CM Offline as an XML and open the extracted file with a text editor of choice. Validate .xml through Dolby Metafier.
Image Character values:
Issue: The metadata contains <ImageCharacter> values of 0,0,0 for any shots that are not black frames. This indicates the shot has not been properly analyzed when creating the HDR metadata. These shots should appear the same in both HDR and SDR on most devices, as no color mapping is being applied. Although, some devices will translate the 0,0,0 values as black frames instead of displaying any picture at all.
Example: LG G6 monitors, Vizio M Series monitors, TCL monitors
Best Practice: This can manually be confirmed within the metadata itself, either by inspecting the shot or searching through the extracted DoVi metadata for any 0,0,0 values. As all shots must be analyzed, this always requires a fix.
Color mapping/ timing error:
Issue: Durations in metadata do not align with hard cuts in the video, causing color/ luminance mistimes (shifts) midshot in the SDR video.
Best Practice: Extract the metadata and validate for overlapping and missing durations using Dolby Metafier prior to QC. Also, use clip inspector in supported software to check for metadata value changes that do not align with cuts. This always requires a fix.