Support fourcc auv2.

Fixes ticket #101.

libavcodec/raw.c

@@ -61,6 +61,7 @@ const PixelFormatTag ff_raw_pix_fmt_tags[] = {
     { PIX_FMT_UYVY422, MKTAG('A', 'V', '1', 'x') }, /* Avid 1:1x */
     { PIX_FMT_UYVY422, MKTAG('A', 'V', 'u', 'p') },
     { PIX_FMT_UYVY422, MKTAG('V', 'D', 'T', 'Z') }, /* SoftLab-NSK VideoTizer */
+    { PIX_FMT_UYVY422, MKTAG('a', 'u', 'v', '2') },
     { PIX_FMT_UYYVYY411, MKTAG('Y', '4', '1', '1') },
     { PIX_FMT_GRAY8,   MKTAG('G', 'R', 'E', 'Y') },
     { PIX_FMT_NV12,    MKTAG('N', 'V', '1', '2') },

libavformat/riff.c

@@ -181,6 +181,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', 'B') },
     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'V', '9') },
     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },
+    { CODEC_ID_RAWVIDEO,     MKTAG('a', 'u', 'v', '2') },
     { CODEC_ID_FRWU,         MKTAG('F', 'R', 'W', 'U') },
     { CODEC_ID_R10K,         MKTAG('R', '1', '0', 'k') },
     { CODEC_ID_R210,         MKTAG('r', '2', '1', '0') },