[Webkit-unassigned] [Bug 136450] New: [GStreamer] GST_STREAM_ERROR_TYPE_NOT_FOUND errors are skipped

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=136450

           Summary: [GStreamer] GST_STREAM_ERROR_TYPE_NOT_FOUND errors are
                    skipped
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fvallee at connected-labs.com


Tested on linux / gtk port / gstreamer 1.4.0 but same issue was already there long time ago in Qt port / gstreamer 0.10.19 
(code is very old, http://trac.webkit.org/changeset/83598).

When gstreamer send "GST_STREAM_ERROR_TYPE_NOT_FOUND" error, the error is skipped (= not reported to the MediaPlayerClient)

http://trac.webkit.org/browser/releases/WebKitGTK/webkit-2.4/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp?annotate=blame&rev=172912#L1027

Definition of stalled event is : "The user agent is trying to fetch media data, but data is unexpectedly not forthcoming" 
http://www.w3.org/TR/2011/WD-html5-20110113/video.html#event-media-stalled

Definition of GST_STREAM_ERROR_TYPE_NOT_FOUND is "used when the element doesn't know the stream's type."
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstGError.html

GST_STREAM_ERROR_TYPE_NOT_FOUND doesn't seems related to "data is unexpectedly not forthcoming". I don't know why GST_STREAM_ERROR_TYPE_NOT_FOUND was chosen, but the code is very very old, so maybe gst was lacking some error type back then.

Anyway this cause troubles: when gstreamer try to play an invalid video, it will usually trigger GST_STREAM_ERROR_TYPE_NOT_FOUND.

I didn't find any 'stalled' related regression test, but in LayoutTests/media/broken-video.html, playback of LayoutTests/media/content/garbage.mp4 triggers 2 errors:

Error 4: Could not determine type of stream. (url=file:///xxxx/LayoutTests/media/content/garbage.mp4)
GST_STREAM_ERROR: 4, Could not determine type of stream.
Decode error, let the Media element emit a stalled event.
Error 1: GStreamer encountered a general stream error. (url=file:///xxxx/LayoutTests/media/content/garbage.mp4)
GST_STREAM_ERROR: 1, GStreamer encountered a general stream error.

First error (GST_STREAM_ERROR: 4) is skipped, but second error (GST_STREAM_ERROR: 1) is handled and the test can pass (but only because of the second error).

However if I change the video src to another invalid video (http://itv.mit-xperts.com/hbbtvtest/playerevents/novideo.php/video.mp4), only
"GST_STREAM_ERROR: 4, Could not determine type of stream" error is triggered.
As GST_STREAM_ERROR_TYPE_NOT_FOUND is skipped, the error event is never triggered and the test timeout.

Same test (using modified video src) works fine using chromium (Version 36.0.1985.125 (283153)) and opera 12.16.

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