The next step is to add the content that you want to use. DCP-o-matic can make DCPs from multiple pieces of content, but in this simple example we will just use a single piece. Click the Add file(s)... button, as shown in Figure 3.3, “Adding content files”, and a file chooser will open for you to select the content file to use, as shown in Figure 3.4, “Selecting a video content file”.
Select your content file and click Open. In this case we are using the Sintel trailer that we downloaded earlier.
When you do this, DCP-o-matic will take a look at your file. After a short while (when the progress bar at the bottom right of the window has finished), you can look through your content using the slider to the right of the window, as shown in Figure 3.5, “Examining the content”.
Dragging the slider will move through your video. You can also click the Play button to play the content back. Note that there will be no sound, and playback might not be entirely accurate (it may be slightly slower or faster than it should be, for example). This player is really only intended for brief inspection of content; if you need to check it more thoroughly, use another player such as Totem, mplayer or VLC.