--- a/reqs/Overview.html Wed Aug 22 15:24:48 2012 -0400
+++ b/reqs/Overview.html Fri Aug 24 13:59:35 2012 +0100
@@ -337,9 +337,28 @@
</section>
<section>
- <h3>Soundtrack and sound effects in a video editing tool </h3>
- <p>A person is using an online video editing tool to modify the soundtrack of a video. The editor extracts the existing recorded vocals from the video stream, modifies the levels and performs other modifications of the audio stream. She also adds several songs, including a orchestral background and pop songs, at different parts of the soundtrack. She also adds several Foley effects (footsteps, doors opening and closing, etc.). While editing, the audio and video playback are synced to allow the editor to insert audio samples at the right time. As the length of one of the songs is slightly different from the video segment she is matching it with, she can synchronize the two by slightly speeding up or slowing down the audio track. The final soundtrack is mixed down into the final soundtrack, added to the video as a replacement for the original audio track, and synced with the video track.
- </p>
+ <h3>Short film with director's commentary and audio description</h3>
+
+
+ <p>A video editor is using an online editing tool to refine the soundtrack of a short film. Once the video is ready, she will work with the production team to prepare an audio description of the scenes to make the video work more accessible to people with sight impairments. The video director is also planning to add an audio commentary track to explain the creative process behind the film.</p>
+
+ <p>Using the online tool, the video editor extracts the existing recorded vocals from the video stream, modifies their levels and performs other modifications of the audio stream. She also adds several songs, including a orchestral background and pop songs, at different parts of the film soundtrack. Several Foley effects (footsteps, doors opening and closing, etc.) are also added to make the soundscape of each scene complete. </p>
+
+ <p>While editing, the online tool must ensure that the audio and video playback are synchronized, allowing the editor to insert audio samples at the right time. As the length of one of the songs is slightly different from the video segment she is matching it with, she can synchronize the two by slightly speeding up or slowing down the audio track. The final soundtrack is mixed down into the final soundtrack, added to the video as a replacement for the original audio track, and synced with the video track.</p>
+
+ <p>Once the audio description and commentary are recorded, the film, displayed in a HTML web page, can be played with its original audio track (embedded in the video container) or with any of the audio commentary tracks loaded from a different source and synchronised with the video playback. When there's audio on the commentary track, the main track volume is reduced (ducked) gradually and smoothly brought back to full volume when the commentary / description track is silent. The visitor can switch between audio tracks on the fly, without affecting the video playback. Pausing the video playback also pauses the commentary track, which then remains in sync when playback resumes.</p>
+
+
+ <h4>Notes and Implementation Considerations</h4>
+ <ol>
+ <li>This scenario is, in many ways, fairly similar to a number of others already discussed throughout the document. The ability to lay out a number of sources and mix them in a consistent soundtrack is the subject of the <a href="#online-music-production-tool">Online music production tool</a> scenario, while some effects such as ducking have already been discussed in the <a href="#online-radio-broadcast">Online radio broadcast</a> scenario.</li>
+
+ <li>Essentially, this use case illustrates the need to do all these things in sync with video. In the context of the open web platform, it means that audio processing API to integrate with the <a href="http://www.w3.org/TR/html5/media-elements.html#media-controllers">HTML5 <code>MediaController</code> interface.</li>
+ </ol>
+
+
+
+
</section>
@@ -375,21 +394,6 @@
</ol>
</section>
- <section>
-
-
- <h3>Video commentary </h3>
- <p>The director of a video wants to add audio commentary to explain his creative process, and invites other people involved in the making of the video to do the same. His production team also prepares an audio description of the scenes to make the work more accessible to people with sight disabilities.
- </p><p>The video, displayed in a HTML web page, can be played with its original audio track (embedded in the video container) or with any of the audio commentary tracks loaded from a different source and synchronised with the video playback. When there's audio on the commentary track, the main track volume is reduced (ducked) gradually and smoothly brought back to full volume when the commentary / description track is silent. The visitor can switch between audio tracks on the fly, without affecting the video playback. Pausing the video playback also pauses the commentary track, which then remains in sync when playback resumes.
- </p><p><br />
- </p>
- <h4>UC15 — Notes </h4>
- <p>In discussions about this use case, some people in the group expressed a wish that this use case illustrate a need for the audio processing API to work well with the HTML5 <a href="http://dev.w3.org/html5/spec/media-elements.html#mediacontroller" title="http://dev.w3.org/html5/spec/media-elements.html#mediacontroller">MediaController</a> interface. As this is an implementation question, this requirement has been kept out of the use case text itself, but the need to work with the HTML5 interface is duly noted.
- </p><p>A <a href="http://people.mozilla.org/~roc/stream-demos/video-with-extra-track-and-effect.html" title="http://people.mozilla.org/~roc/stream-demos/video-with-extra-track-and-effect.html">demo of this particular use case</a> using the MediaStream processing API is available.
- </p>
-
- </section>
-
</section>
<section>