ALPHA_MIX         505 libavcodec/dvdsubdec.c             putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);
ALPHA_MIX         506 libavcodec/dvdsubdec.c             putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);
ALPHA_MIX         507 libavcodec/dvdsubdec.c             putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);