External Media Files

Running experiments in the cloud within Web Browser opens up a lot of opportunities to integrate media files as stimulus material. The ERTS scripting language supports the definition of external image files, video files, and audio files.

These medial files must be accessible via an URL in order to integrate them into the experiment. This means they must reside on a web server or shared via web services like DropBox.

Video and sound files come in different formats and different browsers support different formats. For cross-browser support you can provision the same resource in different formats. For supporting multiple formats do not specify the extension in the URL. Cognition Lab will automatically pick the format which is supported by the browser.

For media resources shared via DropBox, list the full link to the shared file including the extension. To support multiple formats, you can list multiple URLs line by line. Cognition Lab will automatically pick the line which contains a file extension which is compatible with the browser.

To reference an individual DropBox file, you must add the parameter ”?raw=1” to the URL or use the URL https:\\dl.dropbox.com.