Update libvpx sources to v0.9.2-35-ga8a38bc. ...

source/libvpx/vp8/encoder/firstpass.c

 /*
- *  Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
+ *  Copyright (c) 2010 The WebM 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.
  */
 
 
 #include "math.h"
@@ skipping 1383 matching lines @@
         }
 
         if (boost_score > max_boost)
             boost_score = max_boost;
     }
 
     cpi->gfu_boost = (int)(boost_score * 100.0) >> 4;
 
     // Should we use the alternate refernce frame
     if (cpi->oxcf.play_alternate &&
+        cpi->oxcf.lag_in_frames &&
         (i >= MIN_GF_INTERVAL) &&
         (i <= (cpi->frames_to_key - MIN_GF_INTERVAL)) &&          // dont use ARF very near next kf
         (((next_frame.pcnt_inter > 0.75) &&
           ((mv_in_out_accumulator / (double)i > -0.2) || (mv_in_out_accumulator > -2.0)) &&
           //(cpi->gfu_boost>150) &&
           (cpi->gfu_boost > 100) &&
           //(cpi->gfu_boost>AF_THRESH2) &&
           //((cpi->gfu_boost/i)>AF_THRESH) &&
           //(decay_accumulator > 0.5) &&
           (cpi->gf_decay_rate <= (ARF_DECAY_THRESH + (cpi->gfu_boost / 200)))
@@ skipping 1161 matching lines @@
         }
 
         if ((cpi->common.Width != new_width) || (cpi->common.Height != new_height))
         {
             cpi->common.Width = new_width;
             cpi->common.Height = new_height;
             vp8_alloc_compressor_data(cpi);
         }
     }
 }