fix fourcc comment

Originally committed as revision 15169 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/isom.c

@@ -88,7 +88,7 @@ const AVCodecTag codec_movvideo_tags[] = {
     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', 'p') }, /* DVCPRO50 PAL produced by FCP */
     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', 'n') }, /* DVCPRO50 NTSC produced by FCP */
     { CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', 'v') }, /* AVID DV */
-    { CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', '1') }, /* AVID DV */
+    { CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', '1') }, /* AVID DV100 */
     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'q') }, /* DVCPRO HD 720p50 */
     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'p') }, /* DVCPRO HD 720p60 */
     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '5') }, /* DVCPRO HD 50i produced by FCP */