/*{ AV_CODEC_ID_DVAUDIO, MKTAG('d','v','c','a') },*/
{ AV_CODEC_ID_GSM, MKTAG('a','g','s','m') },
{ AV_CODEC_ID_GSM_MS, MKTAG('m','s', 0, '1') },
+ { AV_CODEC_ID_ILBC, MKTAG('i','l','b','c') },
{ AV_CODEC_ID_MACE3, MKTAG('M','A','C','3') },
{ AV_CODEC_ID_MACE6, MKTAG('M','A','C','6') },
{ AV_CODEC_ID_MP1, MKTAG('.','m','p','1') },