[Bug 752883] New: vtdec: error on returning from iOS background

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752883

            Bug ID: 752883
           Summary: vtdec: error on returning from iOS background
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ilya.konstantinov at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Upon returning from iOS background during a running "vtdec" pipeline, we get:

  GST_VIDEO_DECODER_ERROR (vtdec, 1, STREAM, DECODE, (NULL),
      ("VTDecompressionSessionDecodeFrame returned %d", (int) status), ret);

where status == kVTInvalidSessionErr == -12903.

This produces a pipeline error and causes the source to stop. This is highly
undesirable everywhere, and in particular in an RTC app where stopping the
source task causes data loss.

There's a similar Chromium bug. We can see what they did.
https://code.google.com/p/chromium/issues/detail?id=477895

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