[Bug 732910] New: v4l2src: Dectect and workaround decreasing HW timestamp
GStreamer (bugzilla.gnome.org)
bugzilla at gnome.org
Tue Jul 8 10:09:19 PDT 2014
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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