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Well, this is just used for convenience in an attempt to automatically choose the correct color space for the video, and it’s trivial to change too. AssRender will just follow whatever Aegisub is doing.
It’s is much more important for playback software, but there the right way to go is to stop rendering the subtitles onto the video surface and instead handle the subtitles separately, without requiring color space conversion or scaling (like what mplayer2 is doing in its EOSD code with renderers that support it, e.g. gl, gl3, direct3d and vdpau), which eliminates the issue entirely.
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