[Bug 785683] New: Some low FPS Matroska content have no keyframes in cluster starts, problem in stream mode with no Cues.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785683

            Bug ID: 785683
           Summary: Some low FPS Matroska content have no keyframes in
                    cluster starts, problem in stream mode with no Cues.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: opaque.se at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 356719
  --> https://bugzilla.gnome.org/attachment.cgi?id=356719&action=edit
Find cluster starting with keyframe.

When using dynamic FPS giving low FPS for static scenes with constant high
illumination (low noise) many clusters in a saved Matroska may not start with
key frames.

When replaying the file in streaming mode, Cues are not given, and seek events
are targeting closest cluster. If that cluster and likely a number consecutive
clusters lack video key frame, it will give a poor user experience.

It would be advantageous if a seek event would give a key frame.

A patch for the matroska-demux element is suggested.

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