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Both converters can output \pos and deal with font sizes, so they assume a specific script resolution (PlayResX/PlayResY). The implicit assumption was that a specific resolution was guaranteed. The MP_ASS_FONT_PLAYRESY constant is connected to this. Better make it explicit, so that the implicit dependency on MP_ASS_FONT_PLAYRESY is removed. (Unfortunately, libavcodec sub converters still don't set PlayResX/PlayResY explicitly, so the value set by that constant can't be declared as arbitrary yet.) PlayResY=288 is most likely the SSA natural script resolution (or something like this?), as well as the libass and VSFilter default. PlayResX=384 is the fallback value set by libass if PlayResY is set to 288, and PlayResX is unset.