WebmMuxer: do not set DefaultDuration if timestamp delta is not near constant

media/muxers/webm_muxer.cc

 // Copyright 2015 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/muxers/webm_muxer.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 218 matching lines @@
       reinterpret_cast<mkvmuxer::VideoTrack*>(
           segment_.GetTrackByNumber(video_track_index_));
   DCHECK(video_track);
   video_track->set_codec_id(MkvCodeIcForMediaVideoCodecId(video_codec_));
   DCHECK_EQ(0ull, video_track->crop_right());
   DCHECK_EQ(0ull, video_track->crop_left());
   DCHECK_EQ(0ull, video_track->crop_top());
   DCHECK_EQ(0ull, video_track->crop_bottom());
   DCHECK_EQ(0.0f, video_track->frame_rate());
 
-  video_track->set_default_duration(base::Time::kNanosecondsPerSecond /
-                                    frame_rate);
   // Segment's timestamps should be in milliseconds, DCHECK it. See
   // http://www.webmproject.org/docs/container/#muxer-guidelines
   DCHECK_EQ(1000000ull, segment_.GetSegmentInfo()->timecode_scale());
 }
 
 void WebmMuxer::AddAudioTrack(const media::AudioParameters& params) {
   DVLOG(1) << __func__ << " " << params.AsHumanReadableString();
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK_EQ(0u, audio_track_index_)
       << "WebmMuxer audio can only be initialised once.";
@@ skipping 74 matching lines @@
 
 WebmMuxer::EncodedVideoFrame::EncodedVideoFrame(
     std::unique_ptr<std::string> data,
     base::TimeTicks timestamp,
     bool is_keyframe)
     : data(std::move(data)), timestamp(timestamp), is_keyframe(is_keyframe) {}
 
 WebmMuxer::EncodedVideoFrame::~EncodedVideoFrame() {}
 
 }  // namespace media