Add AVC-Intra identifiers used by Flip4Mac for mov files

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit aa42cce5)

libavformat/isom.c

@@ -134,6 +134,8 @@ const AVCodecTag codec_movvideo_tags[] = {
     { CODEC_ID_RAWVIDEO, MKTAG('W', 'R', 'A', 'W') },
 
     { CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') }, /* AVC-1/H.264 */
+    { CODEC_ID_H264, MKTAG('a', 'i', '5', '5') }, /* Flip4Mac AVC Intra 50 */
+    { CODEC_ID_H264, MKTAG('a', 'i', '1', '5') }, /* Flip4Mac AVC Intra 100 */
 
     { CODEC_ID_MPEG1VIDEO, MKTAG('m', '1', 'v', '1') }, /* Apple MPEG-1 Camcorder */
     { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'e', 'g') }, /* MPEG */