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27c5550de2
Simple enough to do. May have mixed results. Typically, bitmap subtitles will have a tight bounding box around the rendered text. But if for example there is text on the top and bottom, it may be a single big bitmap with a large transparent area between top and bottom. In particular, DVD subtitles are really just a single screen-sized RLE-encoded bitmap, though libavcodec will crop off transparent areas. Like with sd_ass, you can't move subtitles _down_ if they are already in their origin position. This could probably be improved, but I don't want to deal with that right now.