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Tutorial 12: HEVC analysis
12.
Click the
Chroma Transform Unit
(TU) tooltip
to view the Chroma
TU types as shown below.
Unlike the other HEVC tooltips, where the types are primarily based on the
type of encoding (inter/intra etc), the Chroma TU overlay gives a picture of
TU types based on their sizes (4x4, 8x8, etc).
The colors used are displayed onscreen in the TU types color key tooltip. TUs
that are displayed grey imply that they are skipped (Skip
fl
ag-true; this can be
checked in the Coding Unit tooltip).
The grid lines shown below are displayed only when the video is either in
pause or stop mode. In all other modes, only the TU overlay colors are
displayed.
In the case of a Chroma TU, a 8x8 CU can be colored yellow completely
marking 4x4 (as per color key tooltip). This implies that only a 4x4 region of
the 8x8 CU has been transform coded (4:2:0 subsampling).
Figure 108: Chroma Transform Unit (TU) tooltip for HEVC streams
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MTS4EAV7 HEVC / AVC Video and Compressed Audio Analyzer Tutorials