Don't forget the ffmpeg input buffer padding when allocating a codec's

media/video/ffmpeg_video_decode_engine.cc

 // Copyright (c) 2011 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/video/ffmpeg_video_decode_engine.h"
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
 #include "base/task.h"
 #include "media/base/buffers.h"
@@ skipping 54 matching lines @@
   codec_context_->codec_type = AVMEDIA_TYPE_VIDEO;
   codec_context_->codec_id = VideoCodecToCodecID(config.codec());
   codec_context_->coded_width = config.width();
   codec_context_->coded_height = config.height();
 
   frame_rate_numerator_ = config.frame_rate_numerator();
   frame_rate_denominator_ = config.frame_rate_denominator();
 
   if (config.extra_data() != NULL) {
     codec_context_->extradata_size = config.extra_data_size();
-    codec_context_->extradata =
-        reinterpret_cast<uint8_t*>(av_malloc(config.extra_data_size()));
+    codec_context_->extradata = reinterpret_cast<uint8_t*>(
+        av_malloc(config.extra_data_size() + FF_INPUT_BUFFER_PADDING_SIZE));
     memcpy(codec_context_->extradata, config.extra_data(),
            config.extra_data_size());
+    memset(codec_context_->extradata + config.extra_data_size(), '\0',
+           FF_INPUT_BUFFER_PADDING_SIZE);
   }
 
   // Enable motion vector search (potentially slow), strong deblocking filter
   // for damaged macroblocks, and set our error detection sensitivity.
   codec_context_->error_concealment = FF_EC_GUESS_MVS | FF_EC_DEBLOCK;
   codec_context_->error_recognition = FF_ER_CAREFUL;
 
   AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
 
   if (codec) {
@@ skipping 293 matching lines @@
       break;
   }
   return VideoFrame::INVALID;
 }
 
 }  // namespace media
 
 // Disable refcounting for this object because this object only lives
 // on the video decoder thread and there's no need to refcount it.
 DISABLE_RUNNABLE_METHOD_REFCOUNT(media::FFmpegVideoDecodeEngine);