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For conversion from RGB to YUV, however, it is required to explicitly set at least the colormatrix for zscale (an explicit setting would be a good thing in general). Since most output formats only support YUV color spaces, something needs to be done about that as well. However, this relies on a separate library (libzimg) that is neither compiled into FFmpeg by default nor packaged by many Linux distributions. The only way to mitigate this within FFmpeg is by inserting the zscale filter before the format conversion, and choosing an appropriate dithering algorithm with it. Anything involving YUV and RGB will result in ugly banding artifacts due to large error. Blender’s video import/export through FFmpeg suffers from swscale’s poor-quality color conversion.

Blender what is ffmpeg