Support Canopus SD50 with fourcc "CDV5".

Fixes ticket #93.

libavformat/riff.c

@@ -107,6 +107,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '5', '0') },
     { CODEC_ID_DVVIDEO,      MKTAG('c', 'd', 'v', 'c') }, /* Canopus DV */
     { CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', 'H') }, /* Canopus DV */
+    { CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', '5') }, /* Canopus DV */
     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', ' ') },
     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', 's') },
     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },