[Bug 764733] New: Regression in YouTube TV tests in WebKit MSE after fix for #760779

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764733

            Bug ID: 764733
           Summary: Regression in YouTube TV tests in WebKit MSE after fix
                    for #760779
    Classification: Platform
           Product: GStreamer
           Version: 1.0.8
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: calvaris at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: sh.yang at lge.com, slomo at coaxion.net
     GNOME version: ---

In our MSE implementation for WebKitForWayland we found that this patch causes
regressions at the tests for YouTube TV.

We are using qtdemux to parse the data appended to the SourceBuffer and it
seems that they delay in exposing the streams introduced by this patch is an
issue.

For us the optimal behavior here would be to remove this patch but I guess
Seungha Yang wouldn't be very happy with it. Any thoughts?

+++ This bug was initially created as a clone of Bug #760779 +++

In case of push mode, qtdemux expose streams after got moov box.
We can not guarantee that moov box has sample data such as sample duration
and the number of sample in stbl box in fragmented format case.
If moov has no sample data, this patch will not expose streams
until get the first moof.
This patch depends on https://bugzilla.gnome.org/show_bug.cgi?id=760505

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