webrtc_H265player/test/prod_decoder/codec/3rdparty/de265/sherlock265

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 asymetric 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.