Download and install VLC video player on your computer. Click the download link in the Resources section. Click the "Open" button when asked after the download completes. Follow the installation instructions given by the VLC installer software. Double-click the VLC player icon to open the program after installation.
Insert a DVD into your computer's DVD/CD tray. Press the "Open/Close" button on your computer's CD/DVD tray. Place the DVD disc in the drive and press the "Open/Close" button again.
Press the "Play" button inside the VLC media player. Press the "Pause" button when you have found the still you want to capture in the movie.
Click "File" and then select "Preferences" inside the program. Select "Video" and then click "Video Snapshot Directory." Navigate the browser window and pick a folder where you want to save the still image.
Click the "Video" button on VLC's digital menu and click "Snapshot." One still frame will be saved automatically to the folder you selected. Repeat this step for any additional frames you want to save.