allow mp2 to be muxed into mp4

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@15155 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/isom.c

@@ -41,6 +41,7 @@ const AVCodecTag ff_mp4_obj_type[] = {
     { CODEC_ID_AAC       , 103 }, /* MPEG2 AAC Low */
     { CODEC_ID_AAC       , 104 }, /* MPEG2 AAC SSR */
     { CODEC_ID_MP3       , 107 }, /* 11172-3 */
+    { CODEC_ID_MP2       , 107 }, /* 11172-3 */
     { CODEC_ID_MP3       , 105 }, /* 13818-3 */
     { CODEC_ID_MPEG1VIDEO, 106 }, /* 11172-2 */
     { CODEC_ID_MJPEG     , 108 }, /* 10918-1 */