Remove unecessary non fatal error statement that very often is printed in the PSNR or SSIM metric n…

webrtc/tools/frame_analyzer/video_quality_analysis.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 442 matching lines @@
       // and will not calculate skipped frames for that part.
       skipped_frames = 0;
     }
     if (it_ref != end_ref && it_ref->first == it_test->first) {
       total_skipped_frames += skipped_frames;
       if (skipped_frames > max_skipped_frames) {
         max_skipped_frames = skipped_frames;
       }
       continue;
     }
-    fprintf(stderr,
+    fprintf(output,
             "Found barcode %d in test video, which is not in reference video",
             it_test->first);
     return;
   }
 
   fprintf(output, "RESULT Max_repeated: %s= %d\n", label.c_str(),
           max_repeated_frames);
   fprintf(output, "RESULT Max_skipped: %s= %d\n", label.c_str(),
           max_skipped_frames);
   fprintf(output, "RESULT Total_skipped: %s= %d\n", label.c_str(),
@@ skipping 27 matching lines @@
     for (iter = results->frames.begin(); iter != results->frames.end() - 1;
          ++iter) {
       fprintf(output, "%f,", iter->ssim_value);
     }
     fprintf(output, "%f] score\n", iter->ssim_value);
   }
 }
 
 }  // namespace test
 }  // namespace webrtc