Consider text tracks in the frame processor for new media segments.

media/filters/source_buffer_stream.cc

 // Copyright (c) 2012 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/filters/source_buffer_stream.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/bind.h"
@@ skipping 429 matching lines @@
   }
 }
 
 bool SourceBufferStream::Append(const BufferQueue& buffers) {
   TRACE_EVENT2("media", "SourceBufferStream::Append",
                "stream type", GetStreamTypeName(),
                "buffers to append", buffers.size());
 
   DCHECK(!buffers.empty());
   DCHECK(media_segment_start_time_ != kNoTimestamp());
+  DCHECK(media_segment_start_time_ <= buffers.front()->timestamp());

[acolwell GONE FROM CHROMIUM, 2014/04/03 00:26:52]

I was wrong. This should be using GetDecodeTimestamp() not timestamp(). I
believe this will prevent the failures in the SourceBufferStream unit tests.

[DaleCurtis, 2014/04/08 20:42:30]

Ah, good call, this fixed the issue.

   DCHECK(!end_of_stream_);
 
   // New media segments must begin with a keyframe.
   if (new_media_segment_ && !buffers.front()->IsKeyframe()) {
     MEDIA_LOG(log_cb_) << "Media segment did not begin with keyframe.";
     return false;
   }
 
   // Buffers within a media segment should be monotonically increasing.
   if (!IsMonotonicallyIncreasing(buffers))
@@ skipping 1715 matching lines @@
     if (buffer->end_of_stream() || buffer->timestamp() >= end)
       break;
     if (buffer->timestamp() + buffer->duration() <= start)
       continue;
     buffers->push_back(buffer);
   }
   return previous_size < buffers->size();
 }
 
 }  // namespace media