mp3: ftell() file offset for VBR tags before ID3v1 parser messes it up.

Originally committed as revision 21737 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mp3.c

@@ -147,10 +147,11 @@ static int mp3_read_header(AVFormatContext *s,
     av_set_pts_info(st, 64, 1, 14112000);
 
     ff_id3v2_read(s);
+    off = url_ftell(s->pb);
+
     if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
         ff_id3v1_read(s);
 
-    off = url_ftell(s->pb);
     if (mp3_parse_vbr_tags(s, st, off) < 0)
         url_fseek(s->pb, off, SEEK_SET);