Merge commit '55fe72a8'

* commit '55fe72a8':
  matroskadec: don't warn about unknown spherical medata when none is present
Merged-by: James Almer <jamrial@gmail.com>

libavformat/matroskadec.c

@@ -1989,7 +1989,13 @@ static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track)
             return AVERROR_INVALIDDATA;
         }
         break;
+    case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
+        /* No Spherical metadata */
+        return 0;
     default:
+        av_log(NULL, AV_LOG_WARNING,
+               "Unknown spherical metadata type %"PRIu64"\n",
+               track->video.projection.type);
         return 0;
     }