SMPTE DCP extended DATA not supported in PROBE result.

[jamiegau]

Hi Remi, I was integrating your PROBE data into my online tool and I noticed that CPL extended data from the now standard SMPTE DCP was not yet implemented.

However Markers are.. and as one came with the other I was surprised.

It's likely quite trivial to implement. Please place on the TODO list. It's quite important in my book.

On this, implementation wise, will it be a sub-object (like ['NamingConvention']) from the main?

[remia]

Hey @jamiegau,

Are we talking about CompositionMetadataAsset as in https://isdcf.com/papers/ISDCF-Doc6-Composition-Metadata-Guidelines.pdf ? If yes it should already be in the probe, either way I would need to check your DCP CPL to investigate.

[jamiegau]

Yes.

FullContentTitleText
ReleaseTerritory 
VersionNumber 
Chain 
Distributor 
Facility 
AlternateContentVersionList_Id 
AlternateContentVersionList_LabelText 
Luminance 
MainSoundConfiguration
MainSoundSampleRate 
MainPictureStoredArea 
MainPictureActiveArea

To be exact..

OK, I found it.. This data is located in CompositionPlaylist->ReelList->[n]->Metadate.

So lets discuss WHY?

Why are you placing the metadata in reellist? I only found it as I greped it out.. reellist is data about each reel. As such, data that is connected to the full CPL, not just a single reel.. Why is it deep down under reellist? And if multi reels, does it list the metadata multi times in each reel?

I understand this is likely major change and could break other people's use of the tool. But it's a little broken from my perspective.. The Metadata branch should be in the root of the cpl cranch of the PROBE data tree for all of the GLOBAL values for the DCP. Can you get back to me why it was designed this way? .

[remia]

The Probe is for the most part a 1:1 mapping from the DCP XML files. SMPTE CompositionMetadataAsset has been designed itself to be present in the CPL first reel asset list, that's why the probe from ClairMeta is the way it is, there has been no design decision on our part.

SMPTE 429-16-2014 A CompositionPlaylist element shall contain exactly zero or one CompositionMetadataAsset element (see Table 2) in the first Reel element of the ReelList element. Other CompositionMetadataAsset elements shall be ignored.

[jamiegau]

Um.. Ok I see. Yes, the Extended MetaData is located in CPL.xml files in the first reel... So yes, thats how its mapped into the CPL. So I see your point...

All I can suggest in the end is to somehow mention in the Documentation that Extended MetaData is locationed down there. As logically thinking.. it does not make sense. Why look for global data about the CPL in a list about the reels.... Would also suggest in the main object returned by probe that it has something like obj['ExtendedCplMedaData'] = 'Found under ReelList"

[remia]

I'll add a key under the CompositionPlaylist to indicate the presence of metadata (like is done for Picture, Sound, Subtitles, ...). Given that we plan to update the report object, there will already be breaking change anyway for the next version.

[remia]

Added in #167