how to specify some tiles for encryption?

[justsoso0601]

Now，I use the command:
kvazaar -i vidyo1_720p_60.yuv --preset=ultrafast --input-res=1280x720 --tiles=6x4 --crypto=intra_pred_modes+mvs+mv_signs+trans_coeffs+trans_coeff_signs --mv-constraint=frametilemargin -o out.hevc

this command indeed could generate an encrypted video, but all the tiles are encrypted, how to realize some specified tile encrypted (or some ROI), just like the following pictures.

[Jovasa]

Currently, there is no mechanism in Kvazaar, which would let you to encrypt only certain tiles. If you want to achieve this, you'll have to do the necessary modifications yourself. Overall, it should not be too difficult, you just have to check the ID of the tile when writing the bitstream, and based on that either use the regular bitstream writing functions, or the encryption ones.

[justsoso0601]

Currently, there is no mechanism in Kvazaar, which would let you to encrypt only certain tiles. If you want to achieve this, you'll have to do the necessary modifications yourself. Overall, it should not be too difficult, you just have to check the ID of the tile when writing the bitstream, and based on that either use the regular bitstream writing functions, or the encryption ones.

OK, thanks, I will try.

[da-guo-zzzz]

May I ask, after selecting a specific CU for encryption, I always fail to effectively restrict pollution? What functions of restriction should I consider

[Jovasa]

The encryption can only be contained within a tile, encrypting a singular CU is impossible.

[da-guo-zzzz]

加密只能包含在一个瓦片中，单一CU加密是不可能的。

I would like to ask if it is possible to use CTU as the smallest unit for encryption? Or can only tile be used as the smallest unit for encryption?

[Jovasa]

Only tiles can be used, Kvazaar allows setting the size of tile to a single CTU, but technically that is not allowed by the standard, so it is not guaranteed that the decoder will work correctly.

[da-guo-zzzz]

只能使用瓦片，Kvazaar允许将瓦片大小设置为单个CTU，但技术上标准不允许这样做，所以解码器不能保证能正常工作。

Thank you very much for your help！