Encoder: HEVC: The VAConfigAttribValEncHEVCBlockSizes and VAConfigAttribValEncHEVCFeatures is not precise for VME

[HeJunyan]

System information

• CPU information(cat /proc/cpuinfo | grep "model name" | uniq): Tiger Lake
• GPU information(lspci -nn | grep -E 'VGA|isplay): Gen12

Issue behavior

Describe the current behavior

The query results of VAConfigAttribValEncHEVCBlockSizes and VAConfigAttribValEncHEVCFeatures for VME(VAEntrypointEncSlice) are not very precise. For example, log2_max_coding_tree_block_size_minus3 is still set to 2, which causes the CTU size still be 32.
In fact, according to MSDK's result, this can be set to 3 and set CTU size to 64. This obsolete parameters do not block our encoding result, but the compression performance may not be good enough.

Describe the expected behavior

Please update these parameters setting, for example, sync with MSDK's setting.

[Xiaogangli-intel]

Thanks @HeJunyan, will correct the value of log2_max_coding_tree_block_size_minus3. Except this, did you notice others?

[HeJunyan]

And VAConfigAttribValEncHEVCFeatures.cu_qp_delta, MSDK use 3 but the driver gives 2

[Xiaogangli-intel]

Hi @HeJunyan, VAConfigAttribValEncHEVCFeatures.cu_qp_delta should be 2 (VA_FEATURE_REQUIRED, VA_FEATURE_SUPPORTED=1, VA_FEATURE_NOT_SUPPORTED =0). So this field is correct.

[HeJunyan]

OK. I just wonder where MSDK get the 3 for this.