riff: add FourCC for GeoVision cameras

libavformat/riff.c

@@ -36,7 +36,8 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { AV_CODEC_ID_H264,         MKTAG('S', 'M', 'V', '2') },
     { AV_CODEC_ID_H264,         MKTAG('V', 'S', 'S', 'H') },
     { AV_CODEC_ID_H264,         MKTAG('Q', '2', '6', '4') }, /* QNAP surveillance system */
-    { AV_CODEC_ID_H264,         MKTAG('V', '2', '6', '4') },
+    { AV_CODEC_ID_H264,         MKTAG('V', '2', '6', '4') }, /* CCTV recordings */
+    { AV_CODEC_ID_H264,         MKTAG('G', 'A', 'V', 'C') }, /* GeoVision camera */
     { AV_CODEC_ID_H263,         MKTAG('H', '2', '6', '3') },
     { AV_CODEC_ID_H263,         MKTAG('X', '2', '6', '3') },
     { AV_CODEC_ID_H263,         MKTAG('T', '2', '6', '3') },