Workflow Operation Handler

Introduction

Workflows are the central element to define how a media package is being processed by the Opencast services. Their definitions consist of a list of workflow operations, which basically map a piece of configuration to Opencast code:

<definition xmlns="http://workflow.opencastproject.org">
    ....
    <operation
      id="tag"
      <configurations>
        <configuration key="source-flavors">presentation/trimmed</configuration>
        <configuration key="target-flavor">presentation/tagged</configuration>
      </configurations>
   </operation>
   ...
</definition>

Default Workflow Operations

The following table contains the workflow operations that are available in an out-of-the-box Opencast installation:

Operation Handler	Description	Details
analyze-tracks	Analyze tracks in media package	Documentation
analyze-audio	Analyze first audio stream	Documentation
append	Hold for user to select workflow to continue with	Documentation
archive	Archive the current state of the mediapackage	Documentation
caption	Waiting for user to upload captions	Documentation
cleanup	Cleanup the working file repository	Documentation
comment	Add, resolve or delete a comment	Documentation
compose	Encode media files using FFmpeg	Documentation
composite	Compose two videos on one canvas.	Documentation
concat	Concatenate multiple video tracks into one video track	Documentation
copy	Copy media package elements to target directory	Documentation
cover-image	Generate a cover-image containing metadata	Documentation
defaults	Applies default workflow configuration values	Documentation
editor	Waiting for user to review, then cut video based on edit-list	Documentation
email	Sends email notifications at any part of a workflow	Documentation
encode	Encode media files to differents formats in parallel	Documentation
extract-text	Extracting text from presentation segments	Documentation
http-notify	Notifies an HTTP endpoint about the process of the workflow	Documentation
image	Extract images from a video using FFmpeg	Documentation
image-to-video	Create a video track from a source image	Documentation
incident	Testing incidents on a dummy job	Documentation
ingest-download	Download files from external URL for ingest	Documentation
inspect	Inspect the media (check if it is valid)	Documentation
normalize-audio	Normalize first audio stream	Documentation
partial-import	Import partial tracks and process according to a SMIL document	Documentation
post-mediapackage	Send mediapackage to remote service	Documentation
prepare-av	Preparing audio and video work versions	Documentation
publish-configure	Distribute and publish media to the configured publication	Documentation
publish-engage	Distribute and publish media to the engage player	Documentation
republish	Republishes elements to search	Documentation
retract-configure	Retracts media from configured publication	Documentation
segment-video	Extracting segments from presentation	Documentation
segmentpreviews	Extract segment images from a video using FFmpeg	Documentation
series	Apply series to the mediapackage	Documentation
silence	Silence detection on audio of the mediapackage	Documentation
tag	Modify the tag sets of media package elements	Documentation
trim	Waiting for user to review, then trim the recording	Documentation
waveform	Create a waveform image of the audio of the mediapackage	Documentation
zip	Create zipped archive of the current state of the mediapackage	Documentation