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Short URL: http://html5.org/r/2407

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SVNBugCommentTime (UTC)
2407[Gecko] [Opera] [Webkit] Specify how frequently the timeupdate event should fire.2008-11-17 01:11
Index: source
===================================================================
--- source	(revision 2406)
+++ source	(revision 2407)
@@ -19671,14 +19671,23 @@
    steps.</p></li>
 
    <li><p>If the time was reached through the usual monotonic increase
-   of the current playback position during normal playback, the user
-   agent must then <span>queue a task</span> to <span>fire a simple
-   event</span> called <code
+   of the current playback position during normal playback, and if the
+   user agent has not fired a <code
+   title="event-timeupdate">timeupdate</code> event at the element in
+   the past 15 to 250ms, the user agent must then <span>queue a
+   task</span> to <span>fire a simple event</span> called <code
    title="event-timeupdate">timeupdate</code> at the element. (In the
    other cases, such as explicit seeks, relevant events get fired as
    part of the overall process of changing the current playback
-   position.)</p></li>
+   position.)</p>
 
+   <p class="note">The event thus is not to be fired faster than about
+   66Hz or slower than 4Hz. User agents are encouraged to vary the
+   frequency of the event based on the system load and the average
+   cost of processing the event each time, so that the UI updates are
+   not any more frequent than the user agent can comfortably handle
+   while decoding the video.</p></li>
+
    <li><p>If the time was reached through the usual monotonic increase
    of the current playback position during normal playback, and there
    are <span title="cue range">cue ranges</span> in <var

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