[Bug 785683] New: Some low FPS Matroska content have no keyframes in cluster starts, problem in stream mode with no Cues.
GStreamer (GNOME Bugzilla)
bugzilla at gnome.org
Tue Aug 1 12:20:14 UTC 2017
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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