Movie Maker now allows you to record narration and you can record while watching your video playback. Once recorded you can save the audio file and add it to a separate audio track. You can also add external items such as sound effects to the narration track. Narration can be recorded by clicking on the Record Narration button in the Home tab, or by clicking on the dropdown portion of the button to add an audio file to the narration track.
Waveforms have been added to help you to know where audio is in within your project. You will be able to determine where the high and low points are to help when making editing decisions. Waveforms are enabled from the View tab by clicking on the Waveforms button.
Audio Ducking and Emphasis
To accompany Narration, Movie Maker now allows for audio ducking and emphasized audio. When you add a narration to your project, the audio from all other tracks will be temporarily reduced (ducked) while there is audible content on the narration track. You can also change the priority (emphasized) to one of the other audio tracks, reducing the volume on the remaining tracks. You may also adjust the mix between the two non-emphasized tracks. By default the narration track will be emphasized. These features are available from the Project tab.
Music Store download integration
Movie Maker now provides you with a way to find and download music for your movies from AudioMicro, Free Music Archive (FMA) and Vimeo Music Store download integration. You can now add music to your projects that have the correct rights usage associated with it. Additionally, when you apply a theme to your movies, the credits are updated to include the artists who created the music. Associating the Creative Commons-focused artists helps the artists gain more visibility and notoriety,
Deferred Encode Proxy and Disable Transcoding Options
After adding non-naively supported video to your project, Movie Maker will now generate low-resolution video previews for use when making edits to your movie, allowing you to edit your movie more quickly than previous versions. You can also disable video preview file preparation and sandboxing of non-native file types when saving a movie. However, this may have a negative impact on performance. These options are accessible from the new Advanced tab in the File menu.
MPEG-4/H.264 Encoding (MP4)
Movie Maker now supports MPEG-4/H.264 encoding. H.264 encoding allows for smooth and seamless playback of your HD video recordings on a broader range of apps and devices, and reduces the amount of storage required for saving movies. MPEG-4 will be the default file format used when saving your videos, but you will still be able to save your movies using the WMV format.
Video Stabilization and Rolling Shutter Correction (Windows 8 Only)
You can now stabilize your shaky videos and correct wobbling in your Movies using the new Stabilization and Wobble Correction (Rolling Shutter correction) features. These are available from Edit tab’s Videos stabilization button/dropdown.
Movie Maker now supports customizable outlined text, improving the overall quality and readability of the messages in your movies.
Videos As Audio
In addition to supporting a large number of audio formats, you can now use your Video files as an audio source for your audio tracks. To add your audio source from a video file, you can select the Add Music button and then select video extensions to display video files.
Vimeo Publishing Plugin
You can now easily upload your movie content to Vimeo, (one of the leading video sharing sites on the web today). This plugin will follow a similar flow to that of the YouTube publish plugin and is located in the Share group section of the Home tab.
Project files are now periodically saved when working on your projects. This will allow you to recover data from your projects in the case of unexpected or unintentional app closure.
see also Windows Experience Blog: