[Webkit-unassigned] [Bug 196691] [GStreamer] gst_element_get_state: assertion 'GST_IS_ELEMENT (element)' failed in WebCore::MediaPlayerPrivateGStreamer::paused

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196691

Philippe Normand <pnormand at igalia.com> changed:

           What    |Removed                     |Added
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                 CC|                            |eric.carlson at apple.com

--- Comment #10 from Philippe Normand <pnormand at igalia.com> ---
(In reply to Michael Catanzaro from comment #8)
> More from the ending:
> 
> 0:01:09.998240909 98709      0x14b1ea0 DEBUG      webkitmediaplayer
> MediaPlayerPrivateGStreamer.cpp:2243:supportsType: Checking mime-type
> "image/gif"
> 0:01:09.998264264 98709      0x14b1ea0 DEBUG      webkitmediaplayer
> MediaPlayerPrivateGStreamer.cpp:2253:supportsType: Supported: IsNotSupported
> 0:01:09.998276707 98709      0x14b1ea0 DEBUG      webkitmediaplayer
> MediaPlayerPrivateGStreamer.cpp:2287:setPreload: Setting preload to Auto
> 0:01:09.998282618 98709      0x14b1ea0 WARN       webkitmediaplayer
> MediaPlayerPrivateGStreamer.cpp:2204:loadingFailed: Loading failed, error: 4
> 
> (WebKitWebProcess:98709): GStreamer-CRITICAL **: 20:07:52.445:
> gst_element_get_state: assertion 'GST_IS_ELEMENT (element)' failed
> 
> "image/gif" looks suspicious....

Yeah that's indeed the issue. Our supportsType() returns IsNotSupported for image/gif but the MediaPlayer creates a GStreamer MediaPlayerPrivate anyway and tries to load that asset.

Eric, this looks like a bug in MediaPlayer::loadWithNextMediaEngine():


    // If no MIME type is specified or the type was inferred from the file extension, just use the next engine.
    if (!engine && (m_contentType.isEmpty() || m_contentMIMETypeWasInferredFromExtension))
        engine = nextMediaEngine(current);

m_contentType is not empty but m_contentMIMETypeWasInferredFromExtension is true, so the next engine is loaded, regardless of the supportsType() result.

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