[Webkit-unassigned] [Bug 167120] New: [GTK][MSE] Crash on youtube when MSE is enabled but gstreamer cant find the decoder element.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167120

            Bug ID: 167120
           Summary: [GTK][MSE] Crash on youtube when MSE is enabled but
                    gstreamer cant find the decoder element.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
                CC: bugs-noreply at webkitgtk.org

With WebKitGTK+ trunk (r210800):


1. Move gstreamer h264 decoders outside of your gst plugin path
2. Tools/jhbuild/jhbuild-wrapper --gtk run  gst-inspect-1.0 |grep 264|grep -i decoder
3. In my case i moved WebKitBuild/DependenciesGTK/Root/lib/gstreamer-1.0/libgstopenh264.so and WebKitBuild/DependenciesGTK/Root/lib/gstreamer-1.0/libgstlibav.so to /tmp
4. Repeat step 2, ensure no 264 decoders are available.

5. Open youtube with MSE support

$ Tools/Scripts/run-minibrowser --gtk --release  --enable-mediasource=true https://www.youtube.com/watch?v=iNJdPyoqt8U
Starting MiniBrowser.

(MiniBrowser:20425): GLib-GObject-WARNING **: The property GtkToolButton:stock-id is deprecated and shouldn't be used anymore. It will be removed in a future version.
GLib-GIO-Message: Using the 'memory' GSettings backend.  Your settings will not be saved or shared with other applications.
1   0x7ff682156c06 /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(+0x11c3c06) [0x7ff682156c06]
2   0x7ff682156bf6 /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(+0x11c3bf6) [0x7ff682156bf6]
3   0x7ff68308eb3b /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(+0x20fbb3b) [0x7ff68308eb3b]
4   0x7ff6829a3335 /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(WebCore::HTMLMediaElement::removeAudioTrack(WebCore::AudioTrack&)+0x15) [0x7ff6829a3335]
5   0x7ff68254721e /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(WebCore::MediaSource::removeSourceBuffer(WebCore::SourceBuffer&)+0xde) [0x7ff68254721e]
6   0x7ff6825475d5 /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(WebCore::MediaSource::detachFromElement(WebCore::HTMLMediaElement&)+0x125) [0x7ff6825475d5]
7   0x7ff68299f09c /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(WebCore::HTMLMediaElement::noneSupported()+0x28c) [0x7ff68299f09c]
8   0x7ff68299ba84 /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(WebCore::HTMLMediaElement::mediaLoadingFailed(WebCore::MediaPlayerEnums::NetworkState)+0xc4) [0x7ff68299ba84]
9   0x7ff68299f4ea /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(non-virtual thunk to WebCore::HTMLMediaElement::mediaPlayerNetworkStateChanged(WebCore::MediaPlayer*)+0x2a) [0x7ff68299f4ea]
10  0x7ff6830bc2be /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(WebCore::MediaPlayerPrivateGStreamer::handleMessage(_GstMessage*)+0x9ce) [0x7ff6830bc2be]
11  0x7ff67b0e5ad3 /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libgobject-2.0.so.0(g_cclosure_marshal_VOID__BOXEDv+0x73) [0x7ff67b0e5ad3]
12  0x7ff67b0e2f34 /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libgobject-2.0.so.0(+0xff34) [0x7ff67b0e2f34]
13  0x7ff67b0fc048 /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x898) [0x7ff67b0fc048]
14  0x7ff67b0fc942 /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libgobject-2.0.so.0(g_signal_emit+0x82) [0x7ff67b0fc942]
15  0x7ff67c62aa12 /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libgstreamer-1.0.so.0(gst_bus_async_signal_func+0x82) [0x7ff67c62aa12]
16  0x7ff67c62b836 /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libgstreamer-1.0.so.0(+0x40836) [0x7ff67c62b836]
17  0x7ff67afe1cad /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libglib-2.0.so.0(g_main_context_dispatch+0x13d) [0x7ff67afe1cad]
18  0x7ff67afe2048 /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libglib-2.0.so.0(+0x49048) [0x7ff67afe2048]
19  0x7ff67afe2362 /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Root/lib/libglib-2.0.so.0(g_main_loop_run+0xc2) [0x7ff67afe2362]
20  0x7ff6801ac70c /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18(WTF::RunLoop::run()+0x9c) [0x7ff6801ac70c]
21  0x7ff68245dee2 /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37(int WebKit::ChildProcessMain<WebKit::WebProcess, WebKit::WebProcessMain>(int, char**)+0xa2) [0x7ff68245dee2]
22  0x7ff678820b45 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7ff678820b45]
23  0x400cb9 /home/clopez/webkit/webkit/WebKitBuild/Release/bin/WebKitWebProcess() [0x400cb9]

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