Create a Supplemental IMF in SDR

Create a Supplemental IMF in SDR

The purpose of this tutorial is to introduce you to the main steps for creating an additional package from an existing IMF according to Netflix specifications. For details on how to perform certain operations, please refer to MIST user manual.

In this tutorial we will use the previous IMF package created into the tutorial Create an Original Version in SDR.

This IMF is an application 2e in UHD RGB with  5.1 and stereo audio tracks.

I. Start with importing the original version IMF

When importing an IMF Package, MIST will automatically create a new project.

Start by importing the original version IMF :




You can then inspect the package:




Then process to a validation, either using MIST validation tests or Photon.

In this case our source is an Application 2E with Netflix specifications. for this reason we can see warnings regarding the other applications:




 
By clicking on OK, MIST creates a new timeline with the package's assets.




One video track and a 5.1 soundfield are packaged in one segment. 




In this example, we want to add a logo at the beginning of the Original Version.

We can browse through the Windows file browser to drag and drop the media into the Quick Library.

Add media in the timeline

Select your media from the Quick Library . 
First your video file then the audio channels of the two audio configurations in order of pasting. 
Take the assets using the function of carrying (select the clip then drag it by holding left click). 

Before placing them, verify the insertion method is INSERT by clicking the REPLACE / INSERT button on the top left of the timeline:





Check that your playhead position is at the desired location and that the tracks where the media should be pasted are active and selected (the track name is highlighted in cyan). 

For audio tracks, just click on the first audio channel, here it is the left channel of our 5.1:




Use `Ctrl + Alt + V` to paste the media (stacked at cursor).

Fit the timeline

We can notice that the media is longer than the composition and the reel. We need to fit them:




First, fit the composition by calling the timeline hotbox `Ctrl + right click`. Then go to the COMPOSITION tab:





Second, we need to modify reels because of the new composition range.
What is not covered by a reel will not be exported.
To do this we can use the Auto Reels function and use the FIXED REEL COUNT method to obtain a single reel covering our whole content:









Before going into the IMF export panel, check in your COMPOSITION SETTINGS if the type of composition is on Versioning:




II. The IMF export module

For the supplemental package, we need to update the name.
(There is not naming convention yet for Netflix. For now, it's up to your discretion).

Select an appropriate Netflix template. Here it will be Netflix SDR RGB 444 because of our content:





Do not forget to check your metadata and update it if necessary (e.g. audio language if any etc).

After that, just copy/paste the composition name in:
Composition tab → Title. 




As well ad in Packing tab → Annotation, 




In the Naming tab, we can use some tags to name the assets and find them easily. Here we want that each asset takes the name of the composition.
For that, we need to use the $PackageName$ tag:




The Differential Package


In MIST, the common supplemental package is called Differential Package.
That means that we want to create a new package with the new assets only.
The composition playlist of this package will need the assets of the original one to be playable.

To build it, we need to export the supplemental version from the OV's timeline. Set the package type to Differential and MIST will process the additional media only.





If you select your OV package as the destination, you will have several possible methods. In our case, we will use the method called Create New Package according to the Netflix specifications:




If you want to export the package in a new directory, just choose the Package type as Differential. No method is available.

Then export your package by clicking MAKE IMF

As we see, the VF-1 have only one MXF video file around 217 Ko 
MIST has just re-encoded the logo and the audio tracks corresponding to its duration.




III. Import and Q.C of the supplemental version

As soon as your supplemental version has been exported, you can import into MIST to check that everything is correct.

From your current project you can import the new package version of your IMF from the Library ( `F2` ).

In the CONTENT tab, we can see all metadata of our package.
Track files written in red indicate the absence of media in the package. This is normal because it is an additional version containing only the new assets specific to the VF. The missing ones are those related to the OV. To control a VF, you must first import its OV.As soon as your supplemental version has been exported, you can import into MIST to check that everything is correct.




This will not be necessary in our example because the OV is already existing in our project.

We advise you to launch a validation test from the VALIDATION tab in order to check the integrity and the application used by your IMF. 

Final step before importing our package into the Project's Library, is to use PHOTON. If there is any issue with this test, it is likely that the package will be rejected by Netflix:




In our situation, Photon warns us about the missing resources in the package. These are the assets present in the OV. 

If your two IMF packages are in the same project, you can toggle between them using the composition drop-down menu into the timeline:






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