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用于广告插播时间点的带内 SCTE-35 命令

Live Stream API 支持两种在直播中插入广告插播时间点的方法信息流：

创建广告插播时间点频道事件
插入带内 SCTE-35 命令

本页介绍了用于广告插播的带内 SCTE-35 命令。

广告标记包含在输入流中，并且必须符合 SCTE-35 规范数字节目插入提示消息 for Cable。 SCTE-35 数据可以使用等于 0x86 的基本数据流类型在 MPEG-TS 基本数据流上传输。只有 SRT 输入串流可用于提取带内 SCTE-35 命令。

Live Stream API 会解析 TS 基本流中的所有 PID。

在 SCTE-35 命令列表中，Live Stream API 支持 SCTE-35 中定义的 splice_insert 命令。

HLS 清单文件

对于 HLS，每个接合命令都会在清单播放列表中生成一个 #EXT-X-CUE-OUT/#EXT-X-CUE-OUT-CONT/#EXT-X-CUE-IN 标记。splice 命令还会生成 #EXT-OATCLS-SCTE35 条目，其中包含以 base64 格式编码的 SCTE-35 数据，如下所示：

#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:44:44.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000007.m4s
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:44:48.143Z
#EXTINF:1.212833
720p60_h264_fmp4-0000000008.m4s
#EXT-OATCLS-SCTE35:/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-CUE-OUT:45.000000
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:44:49.356Z
#EXTINF:2.787167
720p60_h264_fmp4-0000000009.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=2.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:44:52.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000010.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=6.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:44:56.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000011.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=10.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:00.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000012.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=14.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:04.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000013.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=18.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:08.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000014.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=22.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:12.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000015.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=26.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:16.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000016.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=30.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:20.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000017.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=34.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:24.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000018.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=38.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:28.143Z
#EXTINF:4.000000
720p60_h264_fmp4-0000000019.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=42.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:32.143Z
#EXTINF:2.000000
720p60_h264_fmp4-0000000020.m4s
#EXT-X-CUE-OUT-CONT:ElapsedTime=44.787167,Duration=45.000000,SCTE35=/DAlAAAAAAAAAP/wFAVDE1agf+//yBysA/4APcxQAAAAAAAAXhEvvQ==
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:34.143Z
#EXTINF:0.212833
720p60_h264_fmp4-0000000021.m4s
#EXT-X-CUE-IN
#EXT-X-PROGRAM-DATE-TIME:2023-05-19T17:45:34.358Z
#EXTINF:3.784522
720p60_h264_fmp4-0000000022.m4s

DASH 清单文件

对于 DASH，每个接合命令都会在 MPD 文件中生成一个包含 <EventStream> 部分的新时段，如下所示：

<Period id="Dash-32.475" start="PT32.475S">
  <AdaptationSet segmentAlignment="true" maxWidth="1280" maxHeight="720">
    <Representation mimeType="video/mp4" id="720p60_h264_fmp4" codecs="avc1.4d001f" width="1280" height="720" startWithSAP="1" bandwidth="2100000">
      <SegmentTemplate timescale="1000000" initialization="720p60_h264_fmp4/720p60_h264_fmp4-initialization_segment_0000000000.m4s" media="720p60_h264_fmp4/720p60_h264_fmp4-$Number%010d$.m4s" startNumber="9" presentationTimeOffset="1684475755212833">
        <SegmentTimeline>
          <S t="1684475755212833" d="2787167"/>
          <S t="1684475758000000" d="4000000" r="9"/>
          <S t="1684475798000000" d="2000000"/>
          <S t="1684475800000000" d="212833"/>
        </SegmentTimeline>
      </SegmentTemplate>
    </Representation>
    <Representation mimeType="video/mp4" id="360p30_h264_fmp4" codecs="avc1.4d001e" width="640" height="360" startWithSAP="1" bandwidth="600000">
      <SegmentTemplate timescale="1000000" initialization="360p30_h264_fmp4/360p30_h264_fmp4-initialization_segment_0000000000.m4s" media="360p30_h264_fmp4/360p30_h264_fmp4-$Number%010d$.m4s" startNumber="9" presentationTimeOffset="1684475755212833">
        <SegmentTimeline>
          <S t="1684475755212833" d="2787167"/>
          <S t="1684475758000000" d="4000000" r="9"/>
          <S t="1684475798000000" d="2000000"/>
          <S t="1684475800000000" d="212833"/>
        </SegmentTimeline>
      </SegmentTemplate>
    </Representation>
  </AdaptationSet>
  <AdaptationSet segmentAlignment="true" mimeType="audio/mp4" id="1" label="441k_160_aac_fmp4">
    <Representation id="441k_160_aac_fmp4" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="160000">
      <SegmentTemplate timescale="1000000" initialization="441k_160_aac_fmp4/441k_160_aac_fmp4-initialization_segment_0000000000.m4s" media="441k_160_aac_fmp4/441k_160_aac_fmp4-$Number%010d$.m4s" startNumber="9" presentationTimeOffset="1684475755212833">
        <SegmentTimeline>
          <S t="1684475755212833" d="2787167"/>
          <S t="1684475758000000" d="4000000" r="9"/>
          <S t="1684475798000000" d="2000000"/>
          <S t="1684475800000000" d="212833"/>
        </SegmentTimeline>
      </SegmentTemplate>
    </Representation>
  </AdaptationSet>
  <AdaptationSet segmentAlignment="true" mimeType="audio/mp4" id="2" label="48k_160_aac_fmp4">
    <Representation id="48k_160_aac_fmp4" codecs="mp4a.40.2" audioSamplingRate="48000" startWithSAP="1" bandwidth="128000">
      <SegmentTemplate timescale="1000000" initialization="48k_160_aac_fmp4/48k_160_aac_fmp4-initialization_segment_0000000000.m4s" media="48k_160_aac_fmp4/48k_160_aac_fmp4-$Number%010d$.m4s" startNumber="9" presentationTimeOffset="1684475755212833">
        <SegmentTimeline>
          <S t="1684475755212833" d="2787167"/>
          <S t="1684475758000000" d="4000000" r="9"/>
          <S t="1684475798000000" d="2000000"/>
          <S t="1684475800000000" d="212833"/>
        </SegmentTimeline>
      </SegmentTemplate>
    </Representation>
  </AdaptationSet>
  <AdaptationSet contentType="text" lang="en-US" segmentAlignment="true">
    <Representation mimeType="text/vtt" id="caption_webvtt_en_webvtt" bandwidth="4698">
      <SegmentTemplate timescale="1000000" media="caption_webvtt_en_webvtt/caption_webvtt_en_webvtt-$Number%010d$.vtt" startNumber="9" presentationTimeOffset="1684475755212833">
        <SegmentTimeline>
          <S t="1684475755212833" d="2787167"/>
          <S t="1684475758000000" d="4000000" r="9"/>
          <S t="1684475798000000" d="2000000"/>
          <S t="1684475800000000" d="212833"/>
        </SegmentTimeline>
      </SegmentTemplate>
    </Representation>
  </AdaptationSet>
  <AdaptationSet contentType="text" lang="es-CO" segmentAlignment="true">
    <Representation mimeType="text/vtt" id="caption_webvtt_es_webvtt" bandwidth="5450">
      <SegmentTemplate timescale="1000000" media="caption_webvtt_es_webvtt/caption_webvtt_es_webvtt-$Number%010d$.vtt" startNumber="9" presentationTimeOffset="1684475755212833">
        <SegmentTimeline>
          <S t="1684475755212833" d="2787167"/>
          <S t="1684475758000000" d="4000000" r="9"/>
          <S t="1684475798000000" d="2000000"/>
          <S t="1684475800000000" d="212833"/>
        </SegmentTimeline>
      </SegmentTemplate>
    </Representation>
  </AdaptationSet>
  <AdaptationSet contentType="text" lang="zh-CN" segmentAlignment="true">
    <Representation mimeType="text/vtt" id="caption_webvtt_zh_webvtt" bandwidth="7329">
      <SegmentTemplate timescale="1000000" media="caption_webvtt_zh_webvtt/caption_webvtt_zh_webvtt-$Number%010d$.vtt" startNumber="9" presentationTimeOffset="1684475755212833">
        <SegmentTimeline>
          <S t="1684475755212833" d="2787167"/>
          <S t="1684475758000000" d="4000000" r="9"/>
          <S t="1684475798000000" d="2000000"/>
          <S t="1684475800000000" d="212833"/>
        </SegmentTimeline>
      </SegmentTemplate>
    </Representation>
  </AdaptationSet>
  <EventStream timescale="1000000" schemeIdUri="urn:scte:scte35:2013:xml">
    <Event duration="45000000" id="1684475755">
      <SpliceInfoSection xmlns="http://www.scte.org/schemas/35">
        <SpliceInsert outOfNetworkIndicator="true" spliceImmediateFlag="true">
          <BreakDuration autoReturn="true" duration="45000000"/>
        </SpliceInsert>
      </SpliceInfoSection>
    </Event>
  </EventStream>
</Period>