I found that the box_length is shorter than the text_length, and there is no
option to adapt(Equal).
So I suggest ffmpeg.org can add a opption(like boxw_equal_textw) to adapt it !
the old source:
box_w = FFMIN(width - 1 , max_text_line_w);
box_h = FFMIN(height - 1, y + s->max_glyph_h);
the new source:
if(0==s->boxw_equal_textw){
box_w = FFMIN(width - 1 , max_text_line_w);
}else{
box_w = (int)s->var_values[VAR_TEXT_W];
}
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