MSE: Increase log visibility when unfragmented MP4 causes parse failure

media/formats/mp4/box_reader.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/formats/mp4/box_reader.h"
 
 #include <string.h>
 #include <algorithm>
 #include <set>
 
@@ skipping 201 matching lines @@
 }
 
 bool BoxReader::ReadHeader(bool* err) {
   uint64 size = 0;
   *err = false;
 
   if (!HasBytes(8)) return false;
   CHECK(Read4Into8(&size) && ReadFourCC(&type_));
 
   if (size == 0) {
-    // Media Source specific: we do not support boxes that run to EOS.
+    MEDIA_LOG(DEBUG, log_cb_) << "Media Source Extensions do not support ISO "
+                                 "BMFF boxes that run to EOS";
     *err = true;
     return false;
   } else if (size == 1) {
     if (!HasBytes(8)) return false;
     CHECK(Read8(&size));
   }
 
   // Implementation-specific: support for boxes larger than 2^31 has been
   // removed.
   if (size < static_cast<uint64>(pos_) ||
       size > static_cast<uint64>(kint32max)) {
     *err = true;
     return false;
   }
 
   // Note that the pos_ head has advanced to the byte immediately after the
   // header, which is where we want it.
   size_ = size;
   return true;
 }
 
 }  // namespace mp4
 }  // namespace media