lavc/webp: Print a warning for unsupported chunks.

libavcodec/webp.c

@@ -1500,7 +1500,7 @@ exif_end:
         case MKTAG('A', 'N', 'M', 'F'):
         case MKTAG('X', 'M', 'P', ' '):
             AV_WL32(chunk_str, chunk_type);
-            av_log(avctx, AV_LOG_VERBOSE, "skipping unsupported chunk: %s\n",
+            av_log(avctx, AV_LOG_WARNING, "skipping unsupported chunk: %s\n",
                    chunk_str);
             bytestream2_skip(&gb, chunk_size);
             break;