"draw subtitle to overlay" is disable, so i can give a negative offset to show the subtitle outside the image - but it is valid for text subtitle only. For idx+sub, a positive offset is valid, but a negative value will lock subtitle at about 90% position. Therefore, i must apply "extend picture to 4:3" & this need to force aspect ratio again.
Above mentioned is the case for external idx+sub file. Once soft-embedded into mkv container, all settings are invalid.
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