[Bug 788918] vaapi: supports hierarchical prediction encoding
GStreamer (GNOME Bugzilla)
bugzilla at gnome.org
Fri Oct 20 13:27:33 UTC 2017
https://bugzilla.gnome.org/show_bug.cgi?id=788918
Hyunjun Ko <zzoon at igalia.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #361493|needs-work |none
status| |
Attachment #361493|0 |1
is obsolete| |
--- Comment #23 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 361949
--> https://bugzilla.gnome.org/attachment.cgi?id=361949&action=edit
libs: encoder: h264: Add Hierarchical-P encode
Frames are encoded as different layers. A frame in a particular
layer will use pictures in lower or same layer as references.
Which means decoder can drop the frames in upper layer but still
decode lower layer frames.
eg: with 3 temporal layers
T3: P1 P3 P5 P7
T2: P2 P6
T1: P0 P4 P8
T1, T2, T3: Temporal Layers
P1...pn: P-Frames:
P0->P1 , P0->P2, P2->P3, P0->P4......repeat
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