load_glyph        768 libavfilter/vf_drawtext.c     load_glyph(ctx, NULL, 0);
load_glyph        771 libavfilter/vf_drawtext.c     if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
load_glyph       1377 libavfilter/vf_drawtext.c             ret = load_glyph(ctx, &glyph, code);