Set AVFMT_FLAG_GENPTS when demuxing AVI content.

media/filters/ffmpeg_demuxer.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/ffmpeg_demuxer.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 460 matching lines @@
   } else {
     // The duration is unknown, in which case this is likely a live stream.
     max_duration = kInfiniteDuration();
   }
 
   // Some demuxers, like WAV, do not put timestamps on their frames. We
   // assume the the start time is 0.
   if (start_time_ == kNoTimestamp())
     start_time_ = base::TimeDelta();
 
+  // MPEG-4 B-frames cause grief for a simple container like AVI. Enable PTS
+  // generation so we always get timestamps, see http://crbug.com/169570
+  if (strcmp(format_context->iformat->name, "avi") == 0)

[DaleCurtis, 2013/02/12 19:23:30]

avi_crazy_codec_would_still_match_strcmp_reminder

[scherkus (not reviewing), 2013/02/13 17:53:14]

gcc disagrees:
strcmp("avi", "avi") -> 0
strcmp("avi", "avi_long") -> -1

Perhaps you were thinking of the strncmp() case with n=3?
strncmp("avi", "avi", 3) -> 0
strncmp("avi", "avi", sizeof("avi")) -> 0
strncmp("avi", "avi_long", 3) -> 0
strncmp("avi", "avi_long", sizeof("avi")) -> -1

+    format_context->flags |= AVFMT_FLAG_GENPTS;
+
   // Good to go: set the duration and bitrate and notify we're done
   // initializing.
   host_->SetDuration(max_duration);
   duration_known_ = (max_duration != kInfiniteDuration());
 
   int64 filesize_in_bytes = 0;
   url_protocol_.GetSize(&filesize_in_bytes);
   bitrate_ = CalculateBitrate(format_context, max_duration, filesize_in_bytes);
   if (bitrate_ > 0)
     data_source_->SetBitrate(bitrate_);
@@ skipping 187 matching lines @@
   }
   for (size_t i = 0; i < buffered.size(); ++i)
     host_->AddBufferedTimeRange(buffered.start(i), buffered.end(i));
 }
 
 void FFmpegDemuxer::OnDataSourceError() {
   host_->OnDemuxerError(PIPELINE_ERROR_READ);
 }
 
 }  // namespace media