+++ This bug was initially created as a clone of Bug #1257700 +++ With the patch in bug 1257699 applied, the testcase attached to bug 1257700 triggers an assert in the TimeStamp code. [vp9 @ 0x7f3fd3e5c000] Invalid compressed header size [1863] WARNING: FFmpeg video decoder error.: file gecko/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp, line 251 Assertion failure: !aOther.IsNull() (Cannot compute with aOther null value), at gecko/obj-x86_64-unknown-linux-gnu/dist/include/mozilla/TimeStamp.h:476

Mass change P2 -> P3

Crash volume for signature 'mozilla::TimeStamp::operator-': - nightly (version 50): 0 crash from 2016-06-06. - aurora (version 49): 0 crash from 2016-06-07. - beta (version 48): 15 crashes from 2016-06-06. - release (version 47): 26 crashes from 2016-05-31. - esr (version 45): 0 crash from 2016-04-07. Crash volume on the last weeks: Week N-1 Week N-2 Week N-3 Week N-4 Week N-5 Week N-6 Week N-7 - nightly 0 0 0 0 0 0 0 - aurora 0 0 0 0 0 0 0 - beta 1 0 6 8 0 0 0 - release 2 2 2 9 5 4 1 - esr 0 0 0 0 0 0 0 Affected platform: Windows

The testcase in bug 1257700 doesn't assert for me on Win10 or Ubuntu 17.04 in debug builds going back a year (the furthest back mozregression can bisect debug builds). Any objections to closing this out?

Sounds good. Thanks for investigating so thoroughly!

NI myself to land that testcase as a crashtest for posterity.

Crashtest landed. https://hg.mozilla.org/integration/mozilla-inbound/rev/0891da8fa71e