[Bug 786320] New: periodic_keyframe max value
GStreamer (GNOME Bugzilla)
bugzilla at gnome.org
Tue Aug 15 13:37:41 UTC 2017
https://bugzilla.gnome.org/show_bug.cgi?id=786320
Bug ID: 786320
Summary: periodic_keyframe max value
Classification: Platform
Product: GStreamer
Version: git master
OS: Linux
Status: NEW
Severity: normal
Priority: Normal
Component: gstreamer-vaapi
Assignee: gstreamer-bugs at lists.freedesktop.org
Reporter: matteo.valdina at gmail.com
QA Contact: gstreamer-bugs at lists.freedesktop.org
CC: bsreerenj at gmail.com, vjaquez at igalia.com
GNOME version: ---
Created attachment 357627
--> https://bugzilla.gnome.org/attachment.cgi?id=357627&action=edit
patch to increase max period_keyframe
Current implementation of vaapih264enc enforces a keyframe each 300 frames at
maxinum.
This is translated to an IDR each 10 seconds at 30 fps or 5 seconds at 60 fps.
An IDR frame degrade the quality in the case you have a constrained bandwidth
(you can see blocks each 5 or 10 seconds).
In order to solve this scenario, I increased the max value of periodic_keyframe
to a higher value (MAX_UINT).
THe keyframe is generated only when there is a force_keyframe event inside the
encoder pipeline.
I tested with H.264 and I didn't see an issue or artifact appear after awhile.
There is another reason to kept the max value limited to 300?
I attaching my changes for testing.
--
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
More information about the gstreamer-bugs
mailing list