Nested ASC MHL histories explained
A nested ASC MHL history consists of a top-level history which stores references to all child histories in the subdirectories. Nested histories allow you to verify multiple child histories at once and to detect missing subfolders that were previously registered in the history.
Here is an example of a nested ASC MHL history:
Figure 1 shows an example of such a nested history: The red arrows indicate the manifests referencing the files. The orange arrows show the chain files referencing the manifests.
The blue arrows are the references from the top-level history to the latest generations. Since the ascmhl folders in the subdirectories contain two manifests, the history contains two generations.
Creating nested ASC MHL histories
For the following step-by-step guide, let’s assume the cameras A and B. We want to offload the camera cards and create an ASC MHL history for each. In the final step, we perform a backup to create the top-level ASC MHL history.
Offload
- Within Silverstack, create a folder structure that suits your needs (e.g., Day_01/Video/A_Cam as shown in Figure 2)
- Select folder “A_Cam”. While folder “A_Cam” is selected, click the “Offload” button or “cmd + o” to open the Offload Wizard
- Choose a source folder or card to offload
- Go to the “Copy and Verify” section
- Set a new destination path
- Set the path wildcards in following order: “Bin Path” / “(Source) Folder Structure”
- Define a custom checksum method, (e.g., XXH64)
- Run the offload by clicking “Offload”
- Repeat the offload for every card of camera A
- In the Silverstack Library create a new subfolder “B_Cam”
- Perform the steps described above for camera B
- Every camera card folder of camera A/B should now have an ASC MHL history with one generation
Backup
- In Silverstack select folder “Day_01”
- Right-click and select “Backup…” to open the backup wizard
- Choose all files and select “Continue”
- Click “New Destination Path…” and choose a path for the backup
- Click on “Path wildcards”
- Add the path wildcards “Bin Path” and “(Source) Folder Structure” and click ok (the folder structure of the Backup must match the offload structure).
For example: …/Backup/”Bin Path”/”(Source) Folder Structure”/ - Set the checksum method to the same one used for offloading (e.g., XXH64)
- Make sure “Start new ASC MHL history” is disabled
- Click on “Backup Files”
- The top-level history will be created on the next higher level of the folder structure that has all nested ASC MHL histories in common
- In this case the top-level history will be created within folder “Video” (compare Figure 3)
- If you additionally transcoded dailies into folder “Day_01” (as an example), the root history would be created in that folder
- You can then use the folder “Video” for verification in MediaVerify
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