For some reasons, and it's now the 3rd time it has happened, the video card gets blacklisted on my laptop which has the consequence of disabling the h264 hardware decoder: Manually resetting the preferences: gfx.blacklist.direct2d;3 gfx.blacklist.direct2d.failureid;FEATURE_FAILURE_DL_BLACKLIST_g984 gfx.blacklist.hardwarevideodecoding;3 gfx.blacklist.hardwarevideodecoding.failureid;FEATURE_FAILURE_DL_BLACKLIST_g1208 and restarting, allows HW decoder to work again. about:support { "application": { "name": "Firefox", "osVersion": "Darwin 15.4.0", "version": "49.0a1", "buildID": "20160516113508", "userAgent": "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0", "safeMode": false, "updateChannel": "default", "supportURL": "https://support.mozilla.org/1/firefox/49.0a1/Darwin/en-US/", "numTotalWindows": 1, "numRemoteWindows": 0, "remoteAutoStart": false, "autoStartStatus": 2 }, "modifiedPreferences": { "accessibility.typeaheadfind.flashBar": 0, "browser.cache.frecency_experiment": 1, "browser.cache.disk.smart_size.first_run": false, "browser.cache.disk.smart_size_cached_value": 358400, "browser.cache.disk.smart_size.use_old_max": false, "browser.cache.disk.capacity": 358400, "browser.cache.disk.filesystem_reported": 1, "browser.download.importedFromSqlite": true, "browser.places.importBookmarksHTML": false, "browser.places.smartBookmarksVersion": 8, "browser.sessionstore.upgradeBackup.latestBuildID": "20160315195532", "browser.startup.homepage_override.buildID": "20160516113508", "browser.startup.homepage_override.mstone": "49.0a1", "browser.tabs.remote.autostart.2": false, "browser.urlbar.maxRichResults": 12, "browser.urlbar.userMadeSearchSuggestionsChoice": true, "dom.push.userAgentID": "45464314df0a4cb2af5b75c08123e576", "dom.mozApps.maxLocalId": 1001, "dom.apps.reset-permissions": true, "dom.mozApps.used": true, "extensions.lastAppVersion": "49.0a1", "font.internaluseonly.changed": false, "general.useragent.override": "Mozilla/5.0 (Windows NT 6.1; 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Milan, how do we find which entry in the downloadable blacklist this is, and find out which bug added it? I don't remember us intentionally blacklisting drivers for OSX, but it's possible that we did.

Something is clearly wrong, as I'm seeing entries about Direct2D being blocked (don't know how that showed up in there, unless the profile is shared between a Windows computer and this one), but the one listed as blocking video acceleration is an entry from bug 1266220, which does specify "all operating systems", but the driver version shouldn't be matched. I'll check.

Jean-Yves, just to be certain - you do not share profiles somehow between a windows machine and this mac, right?

Never mind, it is the entry from bug 1266220 that is blocking video acceleration here.

By the way, while there is something broken, and there is a bad downloadable blocklist entry, the upside is that it looks like nothing is ever blocked on OS X, so the original issue is still a mystery - Jean-Yves, how do you "know" video is not accelerated?

OK, I see the "supportsHardwareH264": "No". Still, a bit of a mystery. I have gfx.blacklist.hardwarevideodecoding.failureid;FEATURE_FAILURE_DL_BLACKLIST_g1208 set, and accelerated video, but I don't have gfx.blacklist.hardwarevideodecoding;3

No, I do not share this profile across OS. I did copy it from my MacPro desktop (also running 10.11) I had cleared the preferences that were not the default. The Apple decoder calls gfxPlatform::GetPlatform()->CanUseHardwareVideoDecoding() to find out if we can use HW decoding. this returns false (gfxPlatform::sLayersSupportsHardwareVideoDecoding is false). So the decoder will disable hardware decoding. As HW decoding is disabled, we enable MSE with VP9 and so YouTube serves the laptop VP9. I noticed because I was getting a lot of dropped frames with 4K videos. With H264 and hardware decoding it's perfect (so long as it's not 60fps)

This is the bug: We use "<os>All</os>" to mean "All Windows", but it hits beyond that with the blocklist entry introduced in bug 1266220. It is only safe to use for windows-only features, and we can sometimes get away with it because the device ID only appears on Windows. However, this last entry is all devices, given driver, all OS, and that actually means "all drivers" in Firefox.

Review commit: https://reviewboard.mozilla.org/r/54322/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/54322/

Comment on attachment 8754978 [details] MozReview Request: Bug 1274152: All in downloadable blocklist only means All Windows. r?jrmuizel https://reviewboard.mozilla.org/r/54322/#review51010 ::: widget/GfxInfoBase.cpp:282 (Diff revision 1) > else if (os.EqualsLiteral("Android")) > return DRIVER_OS_ANDROID; > +#if defined (XP_WIN) > + // For historical reasons, "All" in blocklist means "All Windows" > else if (os.EqualsLiteral("All")) > return DRIVER_OS_ALL; Should we not rename the DRIVER_OS_ALL enum to be DRIVER_OS_ALL_WINDOWS and then keep this code unconditional? I think that would make help make the other parts of the code line up with the actual meaning.

Comment on attachment 8754978 [details] MozReview Request: Bug 1274152: All in downloadable blocklist only means All Windows. r?jrmuizel https://reviewboard.mozilla.org/r/54322/#review51014

(In reply to Jeff Muizelaar [:jrmuizel] from comment #10) > Comment on attachment 8754978 [details] > MozReview Request: Bug 1274152: All in downloadable blocklist only means All > Windows. r?jrmuizel > > https://reviewboard.mozilla.org/r/54322/#review51010 > > ::: widget/GfxInfoBase.cpp:282 > (Diff revision 1) > > else if (os.EqualsLiteral("Android")) > > return DRIVER_OS_ANDROID; > > +#if defined (XP_WIN) > > + // For historical reasons, "All" in blocklist means "All Windows" > > else if (os.EqualsLiteral("All")) > > return DRIVER_OS_ALL; > > Should we not rename the DRIVER_OS_ALL enum to be DRIVER_OS_ALL_WINDOWS and > then keep this code unconditional? I think that would make help make the > other parts of the code line up with the actual meaning. Had an offline conversation on this topic - this will happen in bug 1274635 - keeping this one simple in case we decide to uplift.

Will need to update the tests.

Comment on attachment 8754978 [details] MozReview Request: Bug 1274152: All in downloadable blocklist only means All Windows. r?jrmuizel Review request updated; see interdiff: https://reviewboard.mozilla.org/r/54322/diff/1-2/