fix parsing error at the end of stream

media/filters/ffmpeg_demuxer.cc

 // Copyright (c) 2010 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 "base/callback.h"
 #include "base/command_line.h"
 #include "base/scoped_ptr.h"
 #include "base/stl_util-inl.h"
 #include "base/string_util.h"
 #include "base/time.h"
@@ skipping 99 matching lines @@
   base::TimeDelta timestamp =
       ConvertStreamTimestamp(stream_->time_base, packet->pts);
   base::TimeDelta duration =
       ConvertStreamTimestamp(stream_->time_base, packet->duration);
   if (stopped_) {
     NOTREACHED() << "Attempted to enqueue packet on a stopped stream";
     return timestamp;
   }
 
   // Convert if the packet if there is bitstream filter.
-  if (bitstream_converter_.get() &&
+  if (packet->data && bitstream_converter_.get() &&
       !bitstream_converter_->ConvertPacket(packet)) {
     LOG(ERROR) << "Format converstion failed.";
   }
 
   // Enqueue the callback and attempt to satisfy a read immediately.
   scoped_refptr<Buffer> buffer =
       new AVPacketBuffer(packet, timestamp, duration);
   if (!buffer) {
     NOTREACHED() << "Unable to allocate AVPacketBuffer";
     return timestamp;
@@ skipping 485 matching lines @@
   read_event_.Wait();
   return last_read_bytes_;
 }
 
 void FFmpegDemuxer::SignalReadCompleted(size_t size) {
   last_read_bytes_ = size;
   read_event_.Signal();
 }
 
 }  // namespace media