Anyway to select SMPTE A to avoid metadata issues?

Anything and everything to do with DCP-o-matic.
Carsten
Posts: 2680
Joined: Tue Apr 15, 2014 9:11 pm
Location: Germany

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by Carsten »

I don't think it's a good idea to enable all sorts of non-standard options in the GUI. I understand why some people may want that functionality, but we risk that this is getting out of control. We will see hints to enable SMPTE 2.0 in order to pass EasyDCP checks, then later we will probably notice that more recent versions of EasyDCP will reject that same format enforcing RDD52. And soon we are at the point again that 'DCP-o-matic is not creating compliant DCPs'. We can't control all these issues, like e.g. finding out which version of EasyDCP a specific distributor uses, and how to react to it.

And I don't think putting those options into advanced settings will help.

I wish we had a special, hidden version for 'power users'. My preferred solution would be to hide all these options in the GUI, and make them only accessible by editing the preferences file manually (there are already a couple of switches in the settings file that can only be changed that way).

Then at least we can be sure that these options are not set accidentally, and that, if someone REALLY needs them, he'd be willing and able to edit them that way.
carl
Site Admin
Posts: 2391
Joined: Thu Nov 14, 2013 2:53 pm

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by carl »

It's a difficult area. We're doing some tests now against EasyDCP 4.1.2 so hopefully that should clarify things a bit. Maybe the Bv2.0 option can go away again...

I'm hoping to work out whether it's even possible to make DoM reasonably "foolproof" against all "QC" software that is being used in the field. If not, I guess that's the time to decide whether to offer users the options they might need to appease whatever a distributor demands, or whether rather to try to empower them to ask questions about what software is being used, and to point out when it is flawed.
soul
Posts: 7
Joined: Fri May 17, 2024 9:02 am

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by soul »

I'm having this exact issue with Deluxe currently (where they are rejecting my DCPs because it's not SMPTE A). They are instead asking for ££££ to 'fix it' themselves.

Carl, I've read over some of your bug reports:
https://dcpomatic.com/bugs/view.php?id=2470
https://dcpomatic.com/bugs/view.php?id=2487

And I can see you've referenced adding some advanced settings in the GUI, but can't work out whether this has been done or not? Am I better doing as Stéphane has suggested and editing the XML file after creation?
carl
Site Admin
Posts: 2391
Joined: Thu Nov 14, 2013 2:53 pm

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by carl »

Hi,
If you go into the "non-standard" tab of preferences and tick "Allow use of SMPTE Bv2.0" you get a new option in the "standard" drop-down "SMPTE (Bv2.0 only)" which I think will do what you want...
soul
Posts: 7
Joined: Fri May 17, 2024 9:02 am

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by soul »

Thanks so much! I will report back on how the Deluxe 'QC' goes.
soul
Posts: 7
Joined: Fri May 17, 2024 9:02 am

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by soul »

Hi Carl, just did a quick test and in the CPL, I'm still getting the <meta:CompositionMetadataAsset> and <MainMarkers> tags, which supposedly aren't included in SMPTE A:
https://hpaonline.com/wp-content/upload ... df#page=21

Within the exported DCP's CPL, it says: <meta:Value>SMPTE-RDD-52:2020-Bv2.1</meta:Value>
Which I'm concerned will stop it passing the checks:

Code: Select all

          <meta:ExtensionMetadataList>
            <meta:ExtensionMetadata scope="http://isdcf.com/ns/cplmd/app">
              <meta:Name>Application</meta:Name>
              <meta:PropertyList>
                <meta:Property>
                  <meta:Name>DCP Constraints Profile</meta:Name>
                  <meta:Value>SMPTE-RDD-52:2020-Bv2.1</meta:Value>
                </meta:Property>
              </meta:PropertyList>
            </meta:ExtensionMetadata>
          </meta:ExtensionMetadataList>
        </meta:CompositionMetadataAsset>
It looks like inside DCP-o-Matic, the difference between SMPTE and SMPTE (Bv2.0 only) is the removal of MCASubDescriptors, but not CompositionMetadataAsset?

I think according to the document above, I should also be removing CompositionMetadataAsset from the CPL.
carl
Site Admin
Posts: 2391
Joined: Thu Nov 14, 2013 2:53 pm

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by carl »

Right, I see - I guess we need a similar feature for SMPTE A as for Bv2.0 - sorry I didn't read your message more thoroughly. Let me see what I can do.
soul
Posts: 7
Joined: Fri May 17, 2024 9:02 am

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by soul »

Thank you! I need to submit these today, so I'll have a go at manually amending the CPL for now.

Question – where it says SMPTE A doesn't include 'markers', am I correct in thinking this means removing the <MainMarkers> tag? Or does this reference a different tag?
carl
Site Admin
Posts: 2391
Joined: Thu Nov 14, 2013 2:53 pm

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by carl »

I would guess it means MainMarkers, like you say.
soul
Posts: 7
Joined: Fri May 17, 2024 9:02 am

Re: Anyway to select SMPTE A to avoid metadata issues?

Post by soul »

Thank you!

Do you think I need to amend anything else in the CPL before sending? Sorry for the questions, I will report back if it passes Deluxe's check so hopefully that will be helpful to others.

Code: Select all

<?xml version="1.0" encoding="UTF-8"?>
<CompositionPlaylist xmlns="http://www.smpte-ra.org/schemas/429-7/2006/CPL">
  <Id>urn:uuid:a63a770f-8e36-4f27-8c92-a166e7ea0b4f</Id>
  <AnnotationText> (redacted) </AnnotationText>
  <IssueDate>2024-05-17T13:27:20+01:00</IssueDate>
  <Issuer>DCP-o-matic 2.16.84 7a9cadc6fe</Issuer>
  <Creator>DCP-o-matic 2.16.84 7a9cadc6fe</Creator>
  <ContentTitleText> (redacted) </ContentTitleText>
  <ContentKind>advertisement</ContentKind>
  <ContentVersion>
    <Id>urn:uuid:de64684f-c83d-4899-9d62-95742f7d5fcd</Id>
    <LabelText>1</LabelText>
  </ContentVersion>
  <RatingList/>
  <ReelList>
    <Reel>
      <Id>urn:uuid:6984c523-b46b-4dba-9b9b-e790a98427cd</Id>
      <AssetList>
        <MainPicture>
          <Id>urn:uuid:91677b39-a4bf-47ab-a1a4-4437c20750e6</Id>
          <EditRate>24 1</EditRate>
          <IntrinsicDuration>408</IntrinsicDuration>
          <EntryPoint>0</EntryPoint>
          <Duration>408</Duration>
          <Hash>tddIXRmjpyJ6jcrIii3MBwIBq20=</Hash>
          <FrameRate>24 1</FrameRate>
          <ScreenAspectRatio>4096 1716</ScreenAspectRatio>
        </MainPicture>
        <MainSound>
          <Id>urn:uuid:23198a19-5d43-4a0d-a19e-72ece757577c</Id>
          <EditRate>24 1</EditRate>
          <IntrinsicDuration>408</IntrinsicDuration>
          <EntryPoint>0</EntryPoint>
          <Duration>408</Duration>
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        </MainSound>
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    <dsig:X509Data>
      <dsig:X509IssuerSerial>
        <dsig:X509IssuerName>dnQualifier=IbCrmgINUVGT6rIlIRXbY2xL0tQ=,CN=.dcpomatic.smpte-430-2.INTERMEDIATE,OU=dcpomatic.com,O=dcpomatic.com</dsig:X509IssuerName>
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Specifically, I was wondering about the URLs referenced and whether they refer to a specific 'SMPTE A/B' format.
http://www.smpte-ra.org/schemas/429-7/2006/CPL
http://www.smpte-ra.org/schemas/429-10/ ... icture-CPL
Last edited by soul on Fri May 17, 2024 1:48 pm, edited 1 time in total.
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