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Frames are encoded as different layers. 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.
B-frames, except the one in top most layer, are reference frames.
All the base layer frames are I or P.
eg: with 3 temporal layers
T3: B1 B3 B5 B7
T2: B2 B6
T1: I0 P4 P8
T1, T2, T3: Temporal Layers
P1...Pn: P-Frames:
B1...Bn: B-frames:
T1: I0->P4 , P4->P8 etc..
T2: I0--> B2 <-- P4
T3: I0--> B1 <-- B2, B2 --> B3 <-- P4
Signed-off-by: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
https://bugzilla.gnome.org/show_bug.cgi?id=788918
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