94786 2012-08-23 00:47:58 -0700 MediaController play() doesn't work 2012-08-27 02:31:47 -0700 1 1 1 Unclassified WebKit Media 528+ (Nightly build) PC Windows 7 RESOLVED WONTFIX P2 Normal --- 0 changbin.shao webkit-unassigned changbin.shao jer.noble oldest_to_newest 702777 0 changbin.shao 2012-08-23 00:47:58 -0700 reproduce step: 1. open attached file in safari/chrome 2. check if video is able to display. result: video is not able to play. 702778 1 160105 changbin.shao 2012-08-23 00:51:10 -0700 Created attachment 160105 test file test.html 703128 2 jer.noble 2012-08-23 10:32:03 -0700 Unfortunately, this code is working exactly as expected. The spec says: "A MediaController is a blocked media controller ... if all of its slaved media elements have their paused attribute set to true." Since the test case has a MediaController with a single slaved media element, and that media element is paused, the MediaController is a blocked media controller, and play() will not cause playback to start until the slaved media element is unpaused. 703662 3 changbin.shao 2012-08-23 19:25:45 -0700 Thanks, it make sense for me now. While I still have questions here. For instance, there are two video tags, with id vid1 & vid2. var con = new MediaController(); vid1.controller = con; vid2.controller = con; con.play();//won't work since MediaController is blocked. vid1.play();//won't work since MediaController is blocked(because MediaElement 2 is still paused) vid2.play(); //works, since MediaController is not blocked now. con.pause();//MediaController is paused. How about its slaved elements, should be paused or not? con.play();//what the result should be? As the spec says: "A MediaController is a blocked media controller if the MediaController is a paused media controller...",so no video should play? 704143 4 jer.noble 2012-08-24 09:12:23 -0700 (In reply to comment #3) > Thanks, it make sense for me now. While I still have questions here. > For instance, there are two video tags, with id vid1 & vid2. > > var con = new MediaController(); > vid1.controller = con; > vid2.controller = con; > con.play();//won't work since MediaController is blocked. > vid1.play();//won't work since MediaController is blocked(because MediaElement 2 is still paused) Not quite. The MediaController is only blocked if *all* of its slaved media elements are paused. So at this point, the MediaController goes from a blocked media controller to a playing one. Vid1 will begin playing. > vid2.play(); //works, since MediaController is not blocked now. > con.pause();//MediaController is paused. How about its slaved elements, should be paused or not? They are blocked on their MediaController. They are still "playing" technically, but their timelines are stopped. > con.play();//what the result should be? As the spec says: "A MediaController is a blocked media controller if the MediaController is a paused media controller...",so no video should play? Once the MediaController goes from a paused media controller to a playing media controller, the slaved media elements should begin playing. (Assuming the MediaController does not become blocked for some other reason, like one of the slaved media elements stalling, etc.) 705106 5 changbin.shao 2012-08-27 02:31:47 -0700 Thanks a lot for your explanation! (In reply to comment #4) > (In reply to comment #3) > > Thanks, it make sense for me now. While I still have questions here. > > For instance, there are two video tags, with id vid1 & vid2. > > > > var con = new MediaController(); > > vid1.controller = con; > > vid2.controller = con; > > con.play();//won't work since MediaController is blocked. > > vid1.play();//won't work since MediaController is blocked(because MediaElement 2 is still paused) > > Not quite. The MediaController is only blocked if *all* of its slaved media elements are paused. So at this point, the MediaController goes from a blocked media controller to a playing one. Vid1 will begin playing. Just for your information. Spec says: "A MediaController is a blocked media controller...if any of its slaved media elements whose autoplaying flag is true still have their paused attribute set to true" && "All media elements have an autoplaying flag, which must begin in the true state", so I think vid2 still blocks mediaController, thus vid1 is still not able to play. Checked my idea on Chrome. > > vid2.play(); //works, since MediaController is not blocked now. > > con.pause();//MediaController is paused. How about its slaved elements, should be paused or not? > > They are blocked on their MediaController. They are still "playing" technically, but their timelines are stopped. > > > con.play();//what the result should be? As the spec says: "A MediaController is a blocked media controller if the MediaController is a paused media controller...",so no video should play? > > Once the MediaController goes from a paused media controller to a playing media controller, the slaved media elements should begin playing. (Assuming the MediaController does not become blocked for some other reason, like one of the slaved media elements stalling, etc.) 160105 2012-08-23 00:51:10 -0700 2012-08-23 00:51:10 -0700 test file test.html text/html 599 changbin.shao PGh0bWw+DQo8Ym9keT4NCg0KPGRpdiBpZD0ncGxheWVyX2NvbnRhaW5lcic+DQogIDx2aWRlbyBp ZD0idmlkIiB3aWR0aD0iMzIwIiBoZWlnaHQ9IjI0MCIgPg0KICAgIDxzb3VyY2Ugc3JjPSI3MjBw Lm1wNCIgdHlwZT0idmlkZW8vbXA0IiAvPg0KICAgIFlvdXIgYnJvd3NlciBkb2VzIG5vdCBzdXBw b3J0IHRoZSB2aWRlbyB0YWcuDQogIDwvdmlkZW8+DQo8L2Rpdj4NCg0KDQo8c2NyaXB0IHR5cGU9 J3RleHQvamF2YXNjcmlwdCcgdHlwZT0idGV4dC9qYXZhc2NyaXB0IiA+DQogIHZhciBwbGF5ZXIg ICAgICAgICAgPSBkb2N1bWVudC5nZXRFbGVtZW50QnlJZCgidmlkIik7DQogIHZhciBjb25zb2xl X2lkICAgICAgPSBkb2N1bWVudC5nZXRFbGVtZW50QnlJZCgnY29uc29sZScpOw0KICANCiAgZnVu Y3Rpb24gdGVzdCgpDQogIHsNCiAgICAgY29uc29sZS5sb2coJ2hlbGxvJyk7DQogICAgIHZhciBj b24gPSBuZXcgTWVkaWFDb250cm9sbGVyKCk7DQogICAgIHBsYXllci5jb250cm9sbGVyID0gY29u Ow0KICAgICBjb24ucGxheSgpOw0KICB9DQogIA0KICB3aW5kb3cub25sb2FkID0gdGVzdDsNCjwv c2NyaXB0Pg0KDQo8L2JvZHk+DQo8L2h0bWw+DQo=