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I'm very new to the field of HEVC codec. I'm using the HM reference code version 10.1. My task is to make block size up to 128x128. So, what I tried was in the configuration file I set the parameters MaxCUWidth, MaxCUHeight as 128 and 128 respectively.

This ensures that the max CU size is limited to 128 x 128. However, the code crashes with the errors:

Error: Minimum CU width must be greater than minimum transform size
Error: Minimum CU Height must be greater than minimum transform size

My problem is I'm not able to figure out where & how the code needs to be changed so that it does not effect other parameters. Any Kind of help regarding the same will be really valuable to me.

Bartłomiej Semańczyk
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Malik Asfandyar
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2 Answers2

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The minimum CU width/height is derived from the MaxCUWidth/MaxCUHeight and the MaxPartitionDepth parameters. MaxPartitionDepth proscribes, how often a CTU can be splitted. So if you also increase MaxPartitionDepth by 1, it should work.

Alternatively, you can increase the parameter QuadtreeTULog2MinSize by 1, in order to increase the minimum transform size, but i would recommend the first approach, as this only increases the CTU size, without changing the rest of the configuration.

Bastian35022
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  • I have made changes accordingly but didn't get my answer because i need to get larger block size (Dimensions) 128x128 but it give me error about making changes for above mention approaches. – Malik Asfandyar Nov 24 '15 at 07:10
  • error is "QuadtreeTULog2MinSize" must be equal or greater then 2 – Malik Asfandyar Nov 24 '15 at 07:11
  • What did you enter for "QuadtreeTULog2MinSize" then? Default should be 2, for 4x4 TUs. – Bastian35022 Nov 24 '15 at 08:09
  • i enter "QuadtreeTULog2MinSize= 2" while "QuadtreeTULog2MaxSize= 6" so then after getting error i change like this "QuadtreeTULog2MinSize= 1" and "QuadtreeTULog2MaxSize= 5" but still got error – Malik Asfandyar Nov 24 '15 at 08:24
  • Hm, that's strange. With `MaxCUWidth` and `MaxCUHeight` = 128, `MaxPartitionDepth` = 5, and `QuadtreeTULog2MinSize` = 2, it should be fine. `QuadtreeTULog2MaxSize` must not be greater than 5, so you should keep it at 5. If it doesn't work, you should debug through the member function `xCheckParameter` of `TAppEncCfg`, where the parameters are checked for validity. – Bastian35022 Nov 24 '15 at 09:22
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Thanks for helping me its done now For HEVC HM version (10.1) needs to modify on only Depth increment of 1 while CusizeWidth and CuSizeheight must be equal to 128. For that purpose I had made changes in log2Bliksize<=7 containing

TComPattern.cpp

and made changes in MAX_CU_DEPTH in

TComRom.h

After that i got Block sizes / CU (Dimensions) of 128x128.

Malik Asfandyar
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