The following table lists some Metafier output messages as well as some background info and potential solutions. 

To learn more about using Metafier, see the How-To: Dolby Vision Professional Tools - Metafier basics tutorial video and for more info on how to quality control a Dolby Vision Master or Mezzanine, please refer to How-To: Dolby Vision Quality Control - Metadata, Masters & Mezzanine files.

Code	Message	Info	Solution
Error	Cannot load a Shot with an existing UniqueID (xxxxxxxxxxxx)	Dynamic Dolby Vision metadata is required for each shot/frame of content. This error occurs when there are shots without L1 metadata.	go back to the grading timeline  find the shot with the UniqueID Re-analyse the shot(s)  re-export the xml
Warning	L1=0,0,0 metadata for longer than 1 second	L1=0,0,0 indicates that a shot contains black. If this is not intentional, fix it.	go back to the grading timeline  find the shot with the ID Re-analyse the shot(s)  re-export the xml
Warning	No L2 Trims found or  No L8 Trims found	L2 (CMv2.9) nor L3/8 (CMv4.0) are mandatory but often present in any Dolby Vision metadata.	confirm by the colorist that no trims are intentional
Warning	Missing L1 on dissolves	L1 metadata on dissolves is stored as frame based in order to ensure a correct and smooth transition from one shot to another. In the early days of Dolby Vision, not all color grading applications supported frame based metadata. Therefore, this error shouldn't be present in recently finished metadata.	use Metafier command --fix-missing-l1-per-frame
Warning	xy Shots contain identical Level2 values or xy Shots contain identical Level8 values	L2 (CMv2.9) or L3/8 (CMv4.0) trim metadata are present upon creative decision. Therefore, multiple shots may contain identical values. If the amount of shots with identical trims is almost equal to every shot in the program, we recommend to check with the colorist to confirm.	go back to the grading timeline and check the L2 or L3/8 values shot by shot. Re-trim where needed. Re-export the xml.
Warning	Color Encoding Primaries and White Point don't match any known values	The Color Encoding Primaries in the xml must match the corresponding video essence color primaries. This warning typically comes from manually malformatted XML files after initial export. Use Metafier to define the color encoding correctly.	use Metafier command --color-encoding <arg> to set the correct values