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description of graphical overlays
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CB - Show Coding Block quadtree structure. Prediction modes are
signalled at this level. CBs can be further subdivided into
PBs for prediction and TBs for residual transforms.
PB - Show Prediction Block structure. CB blocks may be further
subdivided, possibly using asymmetric partitionings. This is
the level on which motion-compensation and intra-prediction is
performed.
TB - Show Transformation Block structure. DCT/DSTs are carried out
on this level.
QP - Quantization Parameter shown as greyscale value.
Brighter blocks for larger QP values (lower quality).
IntraPred - Show intra prediction mode.
* Directional prediction is depicted with a line in the prediction direction
(out of 32 possible directions)
* Planar prediction is depicted by a square.
* DC prediction is depicted by a circle.
PredMode - Show prediction mode.
* red: intra
* blue: inter
* green: skip = inter mode with no PB subdivision and candidate from merge list
MV - Show motion vectors. Vectors from list L0 are drawn in red,
motion vectors from L1 are green. Vectors are magnified by a factor of 4.
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