DEFAULT_TRANSPARENCY_INDEX  297 libavcodec/gif.c         bytestream_put_byte(bytestream, bcid < 0 ? DEFAULT_TRANSPARENCY_INDEX : bcid); /* background color index */
DEFAULT_TRANSPARENCY_INDEX  323 libavcodec/gif.c     bytestream_put_byte(bytestream, bcid < 0 ? DEFAULT_TRANSPARENCY_INDEX : bcid);