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PNG contain RGB data and video contains YUV pixels. FFmpeg will select yuv444p to preserve chroma sampling resolution but that pixel format is not widely compatible. Force yuv420p output. Use ffmpeg -f image2pipe -framerate 1 -i pipe:.png -c:v libx264 -pix_fmt yuv420p -crf 21 -r 30 -y "Blathering.noaudio.mp4"


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This artifact is likely the result of interlacing. And to get rid of it, you can deinterlace it.


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