Merge commit 'c4d37cd9'

* commit 'c4d37cd9':
  matroskadec: export cover art correctly

Conflicts:
	libavformat/matroskadec.c

See: 511585ceMerged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/matroskadec.c

@@ -2159,6 +2159,8 @@ static int matroska_read_header(AVFormatContext *s)
                 }
             }
 
+            attachments[j].stream = st;
+
             if (st->codec->codec_id != AV_CODEC_ID_NONE) {
                 st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
                 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
@@ -2183,7 +2185,6 @@ static int matroska_read_header(AVFormatContext *s)
                         break;
                     }
                 }
-                attachments[j].stream = st;
             }
         }
     }