[Bug 732910] New: v4l2src: Dectect and workaround decreasing HW timestamp

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732910
  GStreamer | gst-plugins-good | git

           Summary: v4l2src: Dectect and workaround decreasing HW
                    timestamp
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


This is a potential future enhancement, some buggy HW (like 2008 iSight) gives
decreasing time-stamp from time to time. It would be nice enhancement if we
could detect, and fallback somehow to avoid the disaster. One way to detect
that, is through excessive latency. V4L2 timestamp are usually taken form
MONOTOINIC clock, but may on older kernel come from wall clock. So we'd have to
watch the diff, which and fallback is it makes no sense anymore.

Kernel maintainers are informed, and are also looking for a workaround.

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