Volunteers have access to a web based administration panel where they can create narrations for the videos.
Creating a narration
There are two kinds of narrations, audio and text. There is no limitation on which version a volunteer may add, however corresponding audio and text tracks shall be interconnected.
Audio tracks are very useful and giving a nice human touch for the video. However having only and audio narration is a con for people who are not as advanced in the language, having decreased ability of hearing or deafblind. Also creating and timing a proper audio narration requires more skills, a silent background, a good quality microphone etc.
This is where text based narrations are coming to the picture, where the volunteers only write what they see.