[webkit-gtk] Question about Media Source Extension
cedric.bellegarde at adishatz.org
Wed Feb 28 05:54:03 PST 2018
Finally got it: https://bugs.webkit.org/show_bug.cgi?id=183211
Le mer. 28 févr. 2018 à 14:31, =?iso-8859-1?q?C=E9dric?= Bellegarde
<"cedric.bellegarde"@adishatz.org> a écrit :
> My bad, after reading Philippe comment, I was searching how the hell
> was this possible. And after testing with epiphany, it was more: "how
> the hell is this possible in Eolie?".
> And the bug was in Eolie, one line was setting it off and later
> another one was setting it on... Sorry for the noise.
> BTW, I will let it on in Eolie as this may allow you to get more
> I'm trying to reproduce one crash for now with: full bt + gstreamer
> debug files.
> Le mer. 28 févr. 2018 à 14:24, Michael Catanzaro
> <mcatanzaro at igalia.com> a écrit :
>> On Wed, Feb 28, 2018 at 1:20 AM, Cédric Bellegarde
>> <cedric.bellegarde at adishatz.org> wrote:
>>> And here my surprise, with -DENABLE_MEDIA_SOURCE=ON and
>>> enable-mediasource=False, 1080p is available in YouTube and
>>> WebKitGTK does not crash anymore.
>> WOW! This is a major discovery.
>> The good news is that you must have been testing our stable release
>> rather than our latest development release, WebKitGTK+ 2.19.91,
>> where we actually have enabled the ENABLE_MEDIA_SOURCE=ON build
>> option. It's still off by default at runtime, because it does not
>> work reliably yet, but that is exactly the configuration that you've
>> It seems quite bad that enabling the build option but not the
>> runtime option enables higher-resolution video playback on YouTube,
>> though, because that means that the feature is somehow web-exposed
>> such that YouTube can detect it, even though it is supposed to be
>> disabled at runtime. That seems like a major bug. It indicates that
>> the runtime option does not function properly in some way or
>> another, and that leaving the build option enabled is risky, and
>> that we should reevaluate our choice to enable the build option.
>> This is somewhat urgent, because we have a new stable release coming
>> up in a week and a half. Enrique, Alicia, could you investigate this
>> to see what is wrong, please?
>> In the past, when the MSE feature was originally developed, WebKit
>> longer the case -- nowadays, we would expect the MSE features to be
>> completely invisible to webpages when the runtime option is disabled
>> -- but perhaps that was never properly implemented for MSE. (That is
>> actually the reason why we have started using more runtime options
>> in WebKit, in preference to build options.) Anyway, I don't know how
>> to fix this; it requires some investigation.
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