Media Items and SubClips¶
Items in the system are represented in collections and search results as “Pods”. These pods can be clicked on and will take you to the Media Item page, examples of media items are:
Placeholders (items not containing any media files)
Media items are created by ingesting content, creating placeholders and auto importing files. Media items can reference one or more files, which are often different versions of the same item. These different versions are referred to as Formats (see below for more information on Formats).
If you have write access to the item, you can change the title by clicking here and saving it.
For the current item operations can be performed by clicking here.
Different views of the item can be shown here.
If previews of the media exist, they are shown here.
Technical metadata derived from the file is presented.
A placeholder is a Media Item without a file (or any Formats attached) but just an empty container to be associated to a file. It can have all the other attributes a Media Item has, including Access Control Lists (ACLs), Relations and Metadata.
A file can at a later date be associated to a placeholder by clicking on the “Ingest to placeholder” button where the media preview usually is to which allows you to choose a file from storage. Please note that this button is only visible if you have write access to the placeholder.
Certain media types can utilize a preview of the Media Item if the media item has the correct Format created.
- Video previews
Can be played through the built-in player, you can scrub forwards and backwards, pause. Different browsers will get different versions of the player depending on capabilities. If you are using a modern browser you will be able to take advantage of our HTML5 player which can step through frames.
- Audio previews
Can be played through the built-in player, you can scrub forwards and backwards and pause playback.
- Image preview
Can be viewed as any other image.
Clicking on the preview will create a larger view of certain item types.
Metadata can be associated to an item. If the item has no metadata group associated to it then you will be presented with your default metadata group which you can fill in. You can also change the metadata group if you have access to multiple groups.
Metadata can either be viewed or if you have the write access to an item you can edit the metadata form on an item.
The title of the item can be changed by clicking on the title at the top of the page.
For more information on Metadata please see the metadata section of this document.
One Media Item can have many associated files with it, these associated managed files are presented in the Formats pane as different versions of the same item such as the original file, low resolution previews and other versions of the file that can be generated.
For example if you upload a video, this is referred to as the Original. New formats can be created of the Original by transcoding to different formats.
Different Formats can also be downloaded and exported from the system, or when you choose to export, new Formats could be dynamically created.
It is advantageous to let the system create, store and move Formats when needed, rather than try to manually manipulate this. Your system administrator can create dynamic rules for your group to automatically create these formats upon ingest.
Thumbnails are auto-generated for supported formats, and are shown in the thumbnails tag. They can be regenerated from the transcode menu.
Posters are still images created from video media at a particular timecode. They are created as a jpeg at the largest size possible from the source media, and they are shared with all users that have access to see the thumbnails and media of an item.
You can create a poster by seeking to a timecode in the player and then clicking on the camera icon in the player. The still image will then be queued for creation by the transcoders, who need to read the original file and then create the image.
Once completed and ready posters can be viewed by clicking on the Poster tab on the right which will open a grid of thumbnails of the each of the posters available for this item (a thumbnail is always created at the same time as the poster). Below the thumbnail is the timecode from when the poster was taken, and a small download icon is visible to the right. Clicking on this small download icon will start a transfer to your browser, or alternatively right click and save the target (the terminology and behavior differ between browsers, but all should allow you to download if you have the right to).
If you click on the small thumbnail of a poster it will open a large screen viewer of the poster images. Left and Right arrow keys can be used to jump between posters if there is more than one available.
The small cross will delete the poster frame.
Transcoding allows you to create new formats of the same item, or to retranscode existing formats. The transcode profiles are created by administrators to define specifications for the transcode. Simply choose the transcode profile and the system will transcode the Original into the new format from the original file.
You system administrator should have details on the specifications set up for the transcode profiles, and be able to inform you on which profile to use and when.
Importing files in to the system can trigger automated transcoding to create previews and other formats you need.
Thumbnails can also be recreated at the same time as transcoding.
Exporting can export a Format to a predefined location set by the administrator. You can also choose to export the metadata at the same time as the file. The choices for the metadata are different projections (translation mappings) of the metadata of the item. You may also be able to assign a specific file name for the file to be exported, if the administrator has enabled it for the export location.
Projections can transform the metadata from one format to another.
Access Control Lists¶
Each item has by default an access control list (ACL) associated with it. The original ingestor or creator the item will have the “owner’s rights” (in other words, all read-and-write access). If you want access to an item that has an ACL restricting you from reading or writing to the item, someone with sufficient privileges can add you to the ACL.
To add access rights choose Add Access Rights, select either a group or user and what rights they have.
To remove an ACL click the Manage to the right of the ACL row.
Note that you must have write access to the item to perform the above.
The rights that can be applied are:
The user or group will have no rights to read or write to the item. Overriding all the previous access rights that they might already have.
The user or group can read metadata and technical metadata and view any previews of the media item, but they can’t change anything.
The user or group can change and add metadata, transcode and export the media item.
The user or group has complete access to the media item.
Default priority is fine for most of the ACL, but as a system administrator you are allowed to override those.
You can see which user has which access through the audits menu.
On the Manage part you can remove and see what Access rights where given
Versions can be used to have multiple versions of the same media, especially useful for Final Cut and Premiere projects.
You can also upload a new version of a file, or promote an old version to the newest version.
Media items can be deleted using the delete functionality. It will remove all references to the item, its ACLs and its metadata and certain versions of the file.
Media items can be downloaded using the
Cantemo Agent. This will download the original file and
Cantemo Agent needs to be installed and configured.
You can view a history of the item, and what has happened to it by whom.
If a video item contains subtitles, these can be displayed in the Portal preview player. By hovering with the mouse over the player, a selector is shown where the displayed subtitle track can be chosen.
Multiple video tracks¶
If a video item contains multiple representations of the same video you can choose which one you want to display by hovering with the mouse over the player, as with the subtitle selector. These representations can be different bitrates or other configuration the administrator has configured.
Return to placeholder¶
If media was ingested to a placeholder by misstake, you can use the “Return to placeholder” functionality to make the item into a placeholder again. This will keep the item’s metadata, including any timed metadata (annotations) but will remove all thumbnails and disassociate the media. The media file will be returned to the “Import from storage list”, making it possible to ingest the same media into the correct placeholder.