moodle-block_opencast

This block can be used to link moodle courses to opencast series. Users with respective priviledges (in the following called teacher) can use this block to upload videos via moodle to opencast. These videos are transmitted to the opencast system by the cronjob and create a event for the respective series there. The block can be used to automatically set the access privileges of moodle users enrolled in the course. All events belonging to the series are displayed in the block. This way, the teacher gets an overview of all recorded lectures as well as planned ones. Further, if setup correctly, the teacher is able to restrict the visibility to moodle groups or prevent access by students at all.

System requirements

• Min. Moodle Version: 3.3

• Opencast API level:

  • Minimum: v1.0.0

  • Recommended: v1.1.0

  • Some features might do not works as expected, when using an older API level.

• Installed plugin: tool_opencast

Block overview

The block has a detail view which displays two lists of videos. The first list shows the upload jobs which are not completed yet. The current status of the videos is shown in a column.

The second table shows all videos of the series which is associated with the block. It is possible that the videos were uploaded by the block or that they were uploaded otherwise. The table shows the upload date as well as the status. Video, which are planned to be recorded in the future, are also displayed in this list. Moreover, the publication channels and the visibility of a video can be displayed.

Usage scenarios

In the following 3 use cases are described, how the plugin can be used.

Use case 1 - Upload a video

The teacher of a course wants to upload the video "Lecture 1" to his Moodle course. Prerequisite: The course page already contains an instance of the Block "Opencast Videos".

Steps to upload a video:

1. Clicking on "Add video" leads to an upload form.
2. Here the teacher can upload a video file to moodle:
   
   
3. Saving the form creates an upload job, which is registered to the Upload Job Queue.
   
   
4. The processing of a video is done during a cron job and contain the following steps:
   1. A new series is created in opencast with the name which was set in the settings, if it is not yet created.
   2. A new group is created in opencast with the name which was set in the settings, if it is not yet created. This step is skipped if "Create a group" is not selected in the settings. This group control the access to the video.
   3. The video is uploaded to opencast, if it does not yet exist or the config reuseexistingupload is false. In this step all permanent and non-permanent ACL-Rules are assigned to the video.
   4. The group is assigned to the video.

Since most operations in the upload process are done by opencast in an asynchronous fashion, uploading a video can take multiple runs of the cronjob to finish.

Use case 2 - Change the visibility

The teacher of a course wants to hide an uploaded video from the students. The (opencast) admin has definded student specific roles.

Steps to change the visiblity:

1. Go to the overview section of the block.
   
   
2. Click on the visiblity icon.
3. In the visibility form the teacher can select the needed visibility state.
   
   
4. The processing of the video starts:
   1. The ACL-Roles of the video are changed and updated in Opencast.
   2. A workflow (must be defined in the settings) is started which refreshes the metadata.

Use case 3 - Linking a recorded series

A teacher wants to link an existing series to his moodle course and control the access to these videos using the list of students in his moodle course. For this the series id has to be reference in the block.

1. Go to the overview section of the block.
2. Go to "Edit series mapping".
   
   
3. Enter the series id and save the form.
4. Now all videos of the series should be displayed in the block and the visibility of them can be adjusted.

Configuration

In the following, we outline the settings for the block. Through the settings, the block can be adjusted to the needs of your platform. Most of the features the block provides, can be further specified or completely turned off.

The core functionality is to upload a video file to moodle, which is then transferred to opencast. This is done via a cronjob, which processes all Upload Jobs in a first in first out fashion.

Please make sure that the Maximum Time limit for cron execution in Site administration->Server->Performance is not restricted (value of 0 means no timelimit). Then the cron job is not terminated early.

IMPORTANT: The plugin tool_opencast bundles some administration settings for all opencast plugins, which have to be configured first!

In addition to the roles to access the opencast API, the opencast user has to be provided with the role ROLE_GROUP_MH_DEFAULT_ORG_EXTERNAL_APPLICATIONS. Otherwise, moodle will not have the capabilities to write or read series created through moodle. This role can be changed, but has to be aligned with one of the roles you set under Roles.

Settings for upload jobs

In this section you can define the following settings:

• How many videos are uploaded within one run of the cronjob. If it is set to 0, the number of videos is not limited.
• Limit the file size of uploaded videos. This feature is currently only working in combination with some core changes. See issue #20.
• Setup the unique shortname of the workflow that should be started after successfully uploading a video file to opencast.
• Select whether the videos should be published to engage player. This results in the configuration field 'publishToEngage' to be set to true or false for the called workflow (only useful if the selected workflow supports this).
• Select if multiple videos with the same content hash are uploaded to opencast only once (legacy feature: Not recommended to be used. With our further development we strive to create one series per course.).
• Allow unassign from course others a 'delete' icon to the teacher, which will unassign the event from the series of the course. (legacy feature: Only useful if events should not actually being deleted!)
• Setup the unique shortname of the workflow that should be started for deleting a video file in opencast. If a workflow is selected, a 'delete' icon is offered to the teacher, which will actually delete the event in the opencast system. We recommend to use only one of the two previous 'delete' options!
• The setting 'Delete videofile from moodle' causes the moodle system to delete the file of the uploaded video as soon as possible. If set to false, the video file will remain in the moodle system in the draft area until a cron job deletes it (usually some days later).
• With 'Allowed file extensions' you can specify which file extensions users can upload as videos. The extensions must exist as file types in Moodle under Site administration -> Server -> File types. If left blank all of Moodle's file types in the type group 'video' are allowed.

Settings for overview page

In this section you can define how many videos should be displayed in the block. Additionally, you can define if the publication channels of each video are displayed to the user.

Access policies

These settings define metadata for the uploaded videos, e.g. the group or series name. You can use the placeholders [COURSEID] and [COURSENAME] in these settings. They are automatically replaced with the courseid/name of the course the respective block instance belongs to.

'Create a group' is a legacy feature, which assigns each uploaded event to a opencast group. From our point of view there is no practical use in this.

Roles

You can define which ACL rules are added to a video. You can add and delete roles and define the respective actions for these roles.

! This might only be relevant if you want to control the access privileges for your opencast videos via moodle !

Then you have to setup the moodle-role-provider for you opencast system (https://docs.opencast.org/develop/admin/configuration/security.user.moodle/).

It is possible to select if roles should be permanent or not. Non-permanent roles can be used to manually change the access of certain user groups (e.g. students) for each video. Roles which are not permanent will be deleted if the video is hidden in the block overview and added again if the video is made visible.

To use this feature, you need to define at least one non-permanent role-action combination and the shortname of opencast workflow for republishing metadata (for OC 4.x this could be ng-republish-metadata, for OC 5.x this could be republish-metadata). In the video overview of the block, the teacher is able to change the visibility of each video. However, the icon to do so, is only present if the two requirements mentioned above are met! This process takes some time, since the opencast workflow needs to finish.

In the ACL Roles the following placeholders can be used:

• [COURSEID]: Will be replaced by the id of the course.
• [COURSEGROUPID]: Should only be used in non-permanent roles. Dependent on the visibility of the event, it is either replaced by the id of the course or (in case the visibility is restricted by groups) it is replaced by a 'G' followed by the id of the group. In case that multiple groups are selected in the visibility dialog, one ACL rule for every group is created. The basic role including the course id is removed in the case of group visibility.

To give an example for Roles, which also meets the LTI standard and which is used by the plugin by default, you can use the following setting:

Role	Actions	Permanent
ROLE_ADMIN	write,read	Yes
ROLE_GROUP_MH_DEFAULT_ORG_EXTERNAL_APPLICATIONS	write,read	Yes
[COURSEID]_Instructor	write,read	Yes
[COURSEGROUPID]_Learner	read	No

Capabilities

There are additional capabilities, with which you can control the access to the features of the block.

Capability	Role in default configuration	Description
block/opencast:addvideo	editingteacher, manager	Add a video via moodle to opencast.
block/opencast:viewunpublishedvideos	editingteacher, manager	View the list of all videos of the course, which are available in opencast (even not published ones)
block/opencast:defineseriesforcourse	manager	Change the series ID which is associated with the block instance or rather course
block/opencast:createseriesforcourse	manager	Create a new series if block/course is not yet associated with one
block/opencast:deleteevent	editingteacher, manager	Allows to delete a video as specified above.
block/opencast:unassignevent	-	Allows to unassign a video from the series of the course as specified above.

Logging

The execution of upload jobs are being logged, which can be viewed at Site administration->Reports->Logs. View the setting "Site Errors" instead of "All activities" you can view only those upload jobs, which failed.

Placement

This plugin is designed as block and, to be used, it will be initially added to a Moodle course by a teacher. The block shows a quick overview over the videos which are uploaded in the block, but mainly links to a fullscreen overview page where the full functionality of the plugin is provided.

If you want to provide the plugin in every course by default without requiring that the teachers adds it to the course, please have a look at Moodle core's $CFG->defaultblocks setting which is set in config.php only and which is described on https://github.com/moodle/moodle/blob/master/config-dist.php.

As an alternative to placing the block by default, you might also want to add a link to the plugin's overview page to the Boost nav drawer. This plugin does not offer support for adding a Boost nav drawer item itself, but we would like to reference the https://moodle.org/plugins/local_boostnavigation plugin for this job. After installing local_boostnavigation to your Moodle instance, please add the following line to the local_boostnavigation | insertcustomcoursenodesusers setting:

Opencast Videos|/blocks/opencast/index.php?courseid={courseid}|||editingteacher,manager|admin|OR|fa-film|opencast|grades

Please take extra care that the editingteacher,manager list of roles should match the list of roles who are given the block/opencast:addvideo capability in your Moodle instance. After adding the Boost nav drawer item, you can also remove the block/opencast:addinstance capability from all roles as adding the block is not really necessary anymore.

License

This plugin is developed in cooperation with the TU Ilmenau and the WWU Münster.

It is based on 2017 Andreas Wagner, SYNERGY LEARNING

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.