Add "m2v1" to fourccs for MPEG-2 video; fixes some MOV files.

Originally committed as revision 19161 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/isom.c

@@ -153,6 +153,7 @@ const AVCodecTag codec_movvideo_tags[] = {
     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'e') }, /* XDCAM EX 1080p25 VBR */
     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'f') }, /* XDCAM EX 1080p30 VBR */
     { CODEC_ID_MPEG2VIDEO, MKTAG('A', 'V', 'm', 'p') }, /* AVID IMX PAL */
+    { CODEC_ID_MPEG2VIDEO, MKTAG('m', '2', 'v', '1') },
 
     { CODEC_ID_JPEG2000, MKTAG('m', 'j', 'p', '2') }, /* JPEG 2000 produced by FCP */