Hi,
As I mentioned before, I send the compressed data by ADV212 encode mode.
When I see the compressed data on my PC, I could not find 22 lines black bars.
If you can de-compress the compressed data by ADV212, please check if you can see the same result whether or not.
Please check the attached file which name is “ADV212 setting parameters.png”.
I use the parameter to set the register of encode mode and decode mode for ADV212.
According to the ADV212 setting parameters, there is a blank region of 14 lines starting #10 and line #273 after the Field bit transition.
However, referenced by output NTSC signals of CCTV camera and ADV7179, the blank region is not exist in the output NTSC signal of ADV7179.
So, I strongly suspect that the decode side of ADV212 has problem when it make 8bit digital data stream with ITU656 standard.
Please give me an opinion about that.