thank you for replies
@Asmodian - that should be -coder parameter in ffmpeg no idea why it is turned on
@sneaker_ger reason is that I locked bitrate at 20k.
@Natty - posted export was done from sample. I did 2 pass on full video, artefacts were still there and looked the same.
regardig command line, as mentioned in first post I am using ffworks, there is no command line
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