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@berak. Sorry for not sharing the code. i figured it by my self. On Mat2 I have done Imgprog to convert inputFrames to RGB. On Mat3 I have done Imgprog to convert inputFrames to Gray. When i concat both different converted color it thrown error.

Now i made both to same color(i.e RGB). It worked. So while doing concat, if there were any imgprog on any mat, the same should be on the other mat.

Thanks for your time in spending time on this query.

Cheers :)