I was doing some digging regarding audio/subtitle info when dealing with combo releases, specifically 4K/BD releases. It seems, that based on the rules, the audio/subtitle info is supposed to pertain to the main disc in the release. In this case, the 4K disc. But, both disc IDs are supposed to be listed in the profile.

I've not found a section in the rules regarding the media type. If you select both 4K and BD, the region coding will show the code for the BD, since 4K discs do not have region codes. So, should the main 4K profile also have the BD media selected, or not? I've noticed a bug in that if only 4K is selected, the DVD 0 region code is selected, even though nothing should be displayed. But that is a bug that will never end up getting fixed and is beyond the scope of this query.

One should create a child profile based on the BD disc ID in order the list the audio and subtitle differences, then both profiles are placed into a boxed set.

Should the BD child profile only have its disc ID listed? Should only the BD media type be selected? Should the cast/crew list be included in both?

Guidance is appreciated.

So, if both media types are checked for the parent and child profiles, how is the child supposed to be indicated that it is the BD media of the combo package? This has come about because I purchased the 85th anniversary  edition of "The Wizard of OZ." The two discs have different audio and subtitle configurations. And, the special features are different, in that the BD has more than the UHD (typical with combo releases). The parent is supposed to list what the 4K media has and the BD child is supposed to list what it has. But, I don't see a way to indicate that the child is the BD.

I found the following regarding 4K region coding, based upon your link. IMHO, any release that adds region code checking is in violation of the BDA.

https://www.scenarist.com/2023/09/14/technical-bulletin-important-information-regarding-ultra-hd-blu-ray-format/?fbclid=IwAR1fOcgh5V5lvcJynPjmw9JHFk70fjZOX_MjV2y8GCoVVQ43T8gXNoN1GjQ

Ken has written the program based upon the fact that a 4K release is not supposed to be region coded. That is proven out by the fact you cannot set the region code in a 4K only release.

Unfortunately, it therefore looks like there is no way to specifically indicate that the child is the BD of a UHD/BD combo release. The person looking at the combo box set is going to have to assume the parent = UHD and the child = BD. Also the person is going to have to assume combo release instead of a real box set, for example, Charmed Complete Series. Most real box sets are really obvious. 

I'm guessing that a lot of people do not contribute, so they wouldn't necessarily know the rules regarding the layout of profiles for combos.

Learn something new every day.

Quoting MrVideo:

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So, if both media types are checked for the parent and child profiles, how is the child supposed to be indicated that it is the BD media of the combo package?

The primary media (4K) profile will have both media types enabled (as per combo set rules) whilst the child profile (BD) will have "Blu-ray" media type enabled, as per standard contribution rules.

Quote:
I found the following regarding 4K region coding, based upon your link. IMHO, any release that adds region code checking is in violation of the BDA.

https://www.scenarist.com/2023/09/14/technical-bulletin-important-information-regarding-ultra-hd-blu-ray-format/?fbclid=IwAR1fOcgh5V5lvcJynPjmw9JHFk70fjZOX_MjV2y8GCoVVQ43T8gXNoN1GjQ

Whilst PSR20 (Player Setting Register 20) is the standard method used by Blu-ray Java to query a player's region, distributor's can potentially implement regional restrictions on 4K discs using several "unofficial" or secondary software-based methods and still be compliant (that is, not use PSR20):
• query the player's country code (PSR19)
• query the player's Java system properties

Quoting ObiKen:

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The primary media (4K) profile will have both media types enabled (as per combo set rules) whilst the child profile (BD) will have "Blu-ray" media type enabled, as per standard contribution rules.

I think I misread the post by  @Nosferatu. I thought he meant that both media types are checked for both the primary and child profiles. I've not found in the rules that the child profile only checks the media type for that disc, in this case BD. But, I like that as it shows what the disc really is. Therefore, in this case the main will be 4K & BD, while the child will be BD.

Thanks for the clarification.

Quoting MrVideo:

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Quoting Rutan:

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For example, of a region locked 4K disc does not play on Australian 4K player same goes for the BD.

I think a distributor that creates a region locked UHD disc that breaks the spirit of the no region coding are nasty and that such a release should be returned as defective.

There may be licensing restrictions that are forcing the distributor to do this.