使用 AWS MediaConverter 生成的 MPEG DASH 上的一种视频变体

Question

I've produced an.MDP using MediaConverter, which has the following video streams

<AdaptationSet mimeType="video/mp4" frameRate="30/1" segmentAlignment="true" subsegmentAlignment="true" startWithSAP="1" subsegmentStartsWithSAP="1" bitstreamSwitching="false">
  <Representation id="1" width="3840" height="1920" bandwidth="67300000" codecs="avc1.4d4033">
    <BaseURL>index3.3840.1920.cmfv</BaseURL>
    <SegmentBase indexRange="764-1091">
      <Initialization range="0-763"/>
    </SegmentBase>
  </Representation>
  <Representation id="2" width="3840" height="1920" bandwidth="67300000" codecs="avc1.4d4033">
    <BaseURL>index5.3840.1920.cmfv</BaseURL>
    <SegmentBase indexRange="764-1091">
      <Initialization range="0-763"/>
    </SegmentBase>
  </Representation>
  <Representation id="3" width="3840" height="1920" bandwidth="67300000" codecs="avc1.4d4033">
    <BaseURL>index7.3840.1920.cmfv</BaseURL>
    <SegmentBase indexRange="764-1091">
      <Initialization range="0-763"/>
    </SegmentBase>
  </Representation>
  <Representation id="4" width="3840" height="1920" bandwidth="67300000" codecs="avc1.4d4033">
    <BaseURL>index9.3840.1920.cmfv</BaseURL>
    <SegmentBase indexRange="764-1091">
      <Initialization range="0-763"/>
    </SegmentBase>
  </Representation>
</AdaptationSet>
<AdaptationSet mimeType="audio/mp4" lang="und" segmentAlignment="0">
  <Representation id="5" bandwidth="96000" audioSamplingRate="48000" codecs="mp4a.40.2">
    <BaseURL>indexaudio.cmfa</BaseURL>
    <SegmentBase indexRange="658-985">
      <Initialization range="0-657"/>
    </SegmentBase>
  </Representation>
</AdaptationSet>

This was produced with the files with the following settings

  new VideoCodecSettings()
                            .withCodec(VideoCodec.H_264)
                            .withH264Settings(
                                new H264Settings()
                                    .withCodecLevel(H264CodecLevel.LEVEL_4_2)
                                    .withMaxBitrate(maxBitRate)
                                    .withRateControlMode("QVBR")
                                    .withQvbrSettings(new H264QvbrSettings()
                                        .withQvbrQualityLevel(quality)
                                    ).withSceneChangeDetect("TRANSITION_DETECTION")
                                )
                        )

When I play it Shaka Player - it only detects a single available variant and will only play the initial stream.

The Shaka player has default configurations but ABR is enabled.

Is this because all the bandwidths are the same?

I've configured with QVBR is that not the best way?

Answer 1

没错，您必须具有不同比特率的 CBR，以便播放器区分变体。