adts demuxer: Set the time base to be the LCM of all ADTS sample rates.

Originally committed as revision 25091 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/aacdec.c

@@ -80,6 +80,9 @@ static int adts_aac_read_header(AVFormatContext *s,
     ff_id3v1_read(s);
     ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC);
 
+    //LCM of all possible ADTS sample rates
+    av_set_pts_info(st, 64, 1, 28224000);
+
     return 0;
 }