+++ This bug was initially created as a clone of Bug #1354506 +++ https://treeherder.mozilla.org/logviewer.html#?job_id=91272380&repo=autoland [task 2017-04-13T11:00:46.482597Z] 11:00:46 INFO - seekToNextFrame rejected: AbortError: The operation was aborted. [task 2017-04-13T11:00:46.483667Z] 11:00:46 INFO - seekToNextFrame rejected: AbortError: The operation was aborted. [task 2017-04-13T11:00:46.484636Z] 11:00:46 INFO - seekToNextFrame rejected: AbortError: The operation was aborted. [task 2017-04-13T11:00:46.485612Z] 11:00:46 INFO - Buffered messages finished [task 2017-04-13T11:00:47.014995Z] 11:00:47 INFO - TEST-UNEXPECTED-FAIL | dom/media/test/test_mediarecorder_record_changing_video_resolution.html | Test timed out. [task 2017-04-13T11:00:47.015922Z] 11:00:47 INFO - reportError@SimpleTest/TestRunner.js:121:7 [task 2017-04-13T11:00:47.016102Z] 11:00:47 INFO - TestRunner._checkForHangs@SimpleTest/TestRunner.js:142:7

I've run into this test timing out locally and have a fix for it (more info in the commit msg). I'm not sure this very bug is from the same issue, since these logs show rejected seeks, and I never saw that. The patch fixes the immediate-seek-on-reject though, so we'll get better logs next time this happens.

try push: https://treeherder.mozilla.org/#/jobs?repo=try&revision=73f49fc974aaeb376c5a4619cd14c12953c941ae

Comment on attachment 8869389 [details] Bug 1356212 - Stabilize test_mr_record_changing_video_resolution.html. https://reviewboard.mozilla.org/r/140692/#review144590 Looks good to me. ::: dom/media/test/test_mediarecorder_record_changing_video_resolution.html:15 (Diff revision 1) > <div id="content"> > </div> > <script class="testbody" type="text/javascript"> > > function startTest() { > - var content = document.getElementById("content"); > + let content = document.getElementById("content"); Nit: this is unused, we can get rid of it, or use it on line 103. ::: dom/media/test/test_mediarecorder_record_changing_video_resolution.html:121 (Diff revision 1) > + // After seeking finished we queue the next seek task on the event > + // loop so it gets in the same queue as the "resize" events. > + setTimeout(seekThroughFrames, 0); > + }) > + .catch(error => { > + ok(false, "seekToNextFrame rejected: " + error) Semicolon after ok. ::: dom/media/test/test_mediarecorder_record_changing_video_resolution.html:123 (Diff revision 1) > + setTimeout(seekThroughFrames, 0); > + }) > + .catch(error => { > + ok(false, "seekToNextFrame rejected: " + error) > - }); > + }); > }; Nit: Can drop the semicolon from function decl.

Comment on attachment 8869389 [details] Bug 1356212 - Stabilize test_mr_record_changing_video_resolution.html. https://reviewboard.mozilla.org/r/140692/#review145038 Looks good, I retriggered Linux tasks ~100 times and there is no error. I hope this one will be the permanent fix.

Pushed by pehrsons@gmail.com: https://hg.mozilla.org/integration/autoland/rev/e2e49d66a482 Stabilize test_mr_record_changing_video_resolution.html. r=achronop,SingingTree