Created attachment 687242 [details] Test Case. This was brought to my attention by Fernando Perez of the iPython Notebook project, and he helpfully provided me with a good testcase of the issue. When using embedded base-64 content for webm video (i.e. the content is specified directly as an attribute of the video tag, encoded in base-64), webm videos seem to only be playable once, and don't allow restarting. Testcase page is attached. The first video on the page is an OGG file, and works fine. The second video is a WEBM file, and cannot be played more than once without reloading the page.
WFM against Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1 ID:20120713134347 Fails in Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.11) Gecko/20100101 Firefox/10.0.11 ID:20121115102332 and Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20121202 Firefox/20.0 ID:20121202030723
(In reply to XtC4UaLL [:xtc4uall] from comment #1) > Fails in Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.11) Gecko/20100101 > Firefox/10.0.11 ID:20121115102332 Arrg, rather should have been Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0 ID:20121128204232
Regression window(cached m-i) Good: http://hg.mozilla.org/integration/mozilla-inbound/rev/b72c41ab1bd3 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120518095652 Bad: http://hg.mozilla.org/integration/mozilla-inbound/rev/1e18c991b40c Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120518103652 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=b72c41ab1bd3&tochange=1e18c991b40c In local build: Last Good: 5232403e7b8f First Bad: 1e18c991b40c Triggered by: 1e18c991b40c Paul Adenot — Bug 756372 - Change |seeking| to prevent seeking in WebM livestream. r=kinetik