[Bug 797250] New: [IOS] VTDec with iOS12 : Decoding glitches

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797250

            Bug ID: 797250
           Summary: [IOS] VTDec with iOS12 : Decoding glitches
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: other
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: alann.sapone at kalyzee.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Dear Community,
On iOS 12, I have been experiencing weird behaviour on decoding video (tested
in playbin).
We can see that the video stutters a lot and nothing weird appears in logs. I
tested the latest master version built with Cerbero, and also an older 1.12
version to check if the problem existed before, but still, it happens everytime
so it might be something new in iOS12 hardware decoding via VTDec.

Step to reproduce are simple : You can start from iOS tutorial 4 (Just need to
update gst_ios_init.x) and set an accessible video url such as
"http://mirrors.standaloneinstaller.com/video-sample/jellyfish-25-mbps-hd-hevc.mp4".
Playing the video will show the anomaly.

Thanks for your precious help.
Alann.

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