The videobooks are small videos in MP4 format that can be played on devices like the iPhone or a computer, using programs such as the QuickTime (recommended) or VLC. Mixed utterances are generated with a tool for automatic speech synthesis with text content. This format can be useful to review a chapter that was read earlier while traveling by train or bus. They are delivered in two ways: as single MP4 files and through a podcast (RSS). The podcast can be opened with an aggregator (see list of aggregators), which automatically downloads all MP4 files in the computer/mobile device to watch when we want.