*sigh* Bugzilla fail. The video spec says that "progress" and "stalled" events should be fired as such: Every 350ms (±200ms) or for every byte received, whichever is least frequent, queue a task to fire a progress event called progress at the element. If at any point the user agent has received no data for more than about three seconds, then queue a task to fire a progress event called stalled at the element. However, it appears we're just sending progress events on a fixed timer interval. When a "stalled" event does fire, it's fired in the middle of a bunch of progress events with the same event.loaded values. EG: ...video loading normally... videoctl: +++ load, 921600 of 11228656 videoctl: Got progress media event videoctl: +++ load, 936080 of 11228656 videoctl: Got progress media event videoctl: +++ load, 1024000 of 11228656 videoctl: Got progress media event videoctl: +++ load, 1024000 of 11228656 videoctl: Got progress media event videoctl: +++ load, 1024000 of 11228656 videoctl: Got progress media event ...a few more bogus progress events @ 1024000... videoctl: Got stalled media event ...bogus progress events keep rolling in... videoctl: Got progress media event videoctl: +++ load, 1024000 of 11228656 videoctl: Got progress media event videoctl: +++ load, 1024000 of 11228656 videoctl: Got progress media event I wrote a little PHP script to send Ogg media with a forced pause during transmission: http://dolske.net/mozilla/tests/video/slowsend.php?rate=100&stallat=1000000&stallfor=15 This sends data at ~100kbps. Once it's sent about 1MB it will pause for 15 seconds and then resume. I also noted in bug 476035 that we sometimes fire bogus progress events like this while seeking. Maybe bug 455654 will also help here? It's not clear to me from looking at the patch.

That's an error on my part reading the spec. I missed the 'least frequent' bit.

Same behavior with bug 455654 fixed.

Should be a relatively easy fix I guess

I think this can just be 'wanted'.

See bug 479863 comment 6. Matthew has a fix.

Fix. Tests pass.

Pushed: http://hg.mozilla.org/mozilla-central/rev/09df911a0ca2