清单选项

本指南介绍了 Video Stitcher API 支持的清单选项功能。这样，您就可以自定义拼接的视频清单。清单选项在会话创建请求中进行配置。详情请参阅以下内容：

准备工作

确保您熟悉 Video Stitcher API 中的介绍性概念和术语。如需了解详情，请参阅技术概览。

简介

默认情况下，拼接的视频清单将包含与源视频清单相同的媒体呈现方式。来源清单可能包含多个媒体呈现形式，但并非所有播放器都能播放。例如，编码后的视频可能同时包含 H.264 和 H.265 视频编解码器，但某个设备上的播放器可能只能播放 H.264。

通过指定要包含在视频清单中的编解码器或比特率，您可以指定要在拼接的视频清单中输出的视频呈现形式。

清单选项

ManifestOptions 对象提供了一些用于自定义拼接视频清单的选项。

HLS

您可以为拼接的 HLS 视频清单自定义以下内容：

  • 按编解码器过滤
  • 仅包含特定比特率
  • 订购视频曲目

对于后续部分，假设以下来源视频清单：

#EXTM3U
#EXT-X-STREAM-INF:BANDWIDTH=440000,RESOLUTION=1920x1080,CODECS="avc1.42e00a,mp4a.40.2"
h264/fhd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=150000,RESOLUTION=640x360,CODECS="avc1.42e00a,mp4a.40.2"
h264/sd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=240000,RESOLUTION=1280x720,CODECS="avc1.42e00a,mp4a.40.2"
h264/hd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=400000,RESOLUTION=1920x1080,CODECS="hvc1.1.4.L126.B0,mp4a.40.2"
h264/fhd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=100000,RESOLUTION=640x360,CODECS="hvc1.1.4.L126.B0,mp4a.40.2"
h264/sd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=200000,RESOLUTION=1280x720,CODECS="hvc1.1.4.L126.B0,mp4a.40.2"
h264/hd/index.m3u8

按编解码器过滤

如需按编解码器过滤视频呈现，请在创建会话时在可选的 manifestOptions 字段中设置编解码器。例如，如需仅在拼接的清单中显示 H.264，请在 includeRenditions 数组中设置编解码器：

{
  "manifestOptions": {
    "includeRenditions": [
      {
        "codecs": "avc1.42e00a,mp4a.40.2",
      },
    ],
  },
}

拼接后的清单中会显示以下内容：

#EXTM3U
#EXT-X-STREAM-INF:BANDWIDTH=440000,RESOLUTION=1920x1080,CODECS="avc1.42e00a,mp4a.40.2"
h264/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=150000,RESOLUTION=640x360,CODECS="avc1.42e00a,mp4a.40.2"
h264/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=240000,RESOLUTION=1280x720,CODECS="avc1.42e00a,mp4a.40.2"
h264/index.m3u8

仅包含特定比特率

如需按比特率过滤视频呈现，请在创建会话时在可选的 manifestOptions 字段中设置比特率。例如，如需在拼接的清单中仅显示两个比特率，请在 includeRenditions 数组中设置比特率：

{
  "manifestOptions": {
    "includeRenditions": [
      {
        "bitrateBps": 150000,
      },
      {
        "bitrateBps": 440000,
      },
    ],
  },
}

拼接后的清单中会显示以下内容：

#EXTM3U
#EXT-X-STREAM-INF:BANDWIDTH=440000,RESOLUTION=1920x1080,CODECS="avc1.42e00a,mp4a.40.2"
h264/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=150000,RESOLUTION=640x360,CODECS="avc1.42e00a,mp4a.40.2"
h264/index.m3u8

按比特率排序

某些播放器可能会对视频呈现顺序比较敏感。您可以将视频呈现方式的顺序设置为 ascending 或 descending，如下所示：

{
  "manifestOptions": {
    "bitrateOrder": "ascending",
  },
}

拼接后的清单中会显示以下内容：

#EXTM3U
#EXT-X-STREAM-INF:BANDWIDTH=100000,RESOLUTION=640x360,CODECS="hvc1.1.4.L126.B0,mp4a.40.2"
h264/sd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=150000,RESOLUTION=640x360,CODECS="avc1.42e00a,mp4a.40.2"
h264/sd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=200000,RESOLUTION=1280x720,CODECS="hvc1.1.4.L126.B0,mp4a.40.2"
h264/hd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=240000,RESOLUTION=1280x720,CODECS="avc1.42e00a,mp4a.40.2"
h264/hd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=400000,RESOLUTION=1920x1080,CODECS="hvc1.1.4.L126.B0,mp4a.40.2"
h264/fhd/index.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=440000,RESOLUTION=1920x1080,CODECS="avc1.42e00a,mp4a.40.2"
h264/fhd/index.m3u8

DASH

对于拼接的 DASH 视频清单，您可以自定义以下内容：

  • 按编解码器过滤
  • 仅包含特定比特率
  • 订购视频曲目

对于后续部分，假设以下来源视频清单：

<Period id="0" start="PT33160.000S">
  <AdaptationSet segmentAlignment="true" maxWidth="1280" maxHeight="720">
    <Representation mimeType="video/mp4" id="640x360-h264" codecs="avc1.64001E" width="640" height="360" startWithSAP="1" bandwidth="150000">
      ...
    </Representation>
    <Representation mimeType="video/mp4" id="1280x720-h264" codecs="avc1.64001E" width="1280" height="720" startWithSAP="1" bandwidth="240000">
      ...
    </Representation>
    <Representation mimeType="video/mp4" id="640x360-h265" codecs="hvc1.1.4.L126.B0" width="640" height="360" startWithSAP="1" bandwidth="100000">
      ...
    </Representation>
    <Representation mimeType="video/mp4" id="1280x720-h265" codecs="hvc1.1.4.L126.B0" width="1280" height="720" startWithSAP="1" bandwidth="200000">
      ...
    </Representation>
  </AdaptationSet>
  <AdaptationSet segmentAlignment="true">
    <Representation mimeType="audio/mp4" id="640x360-audio" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="48472">
      ...
    </Representation>
    <Representation mimeType="audio/mp4" id="1280x720-audio" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="48472">
      ...
    </Representation>
  </AdaptationSet>
</Period>

按编解码器过滤

如需按编解码器过滤视频呈现，请在创建会话时在可选的 manifestOptions 字段中设置编解码器。例如，如需仅在拼接的清单中显示 H.264，请在 includeRenditions 数组中设置编解码器：

{
  "manifestOptions": {
    "includeRenditions": [
      {
        "codecs": "hvc1.1.4.L126.B0",
      },
    ],
  },
}

拼接后的清单中将显示以下内容：

<Period id="0" start="PT33160.000S">
  <AdaptationSet segmentAlignment="true" maxWidth="1280" maxHeight="720">
    <Representation mimeType="video/mp4" id="640x360-h265" codecs="hvc1.1.4.L126.B0" width="640" height="360" startWithSAP="1" bandwidth="100000">
      ...
    </Representation>
    <Representation mimeType="video/mp4" id="1280x720-h265" codecs="hvc1.1.4.L126.B0" width="1280" height="720" startWithSAP="1" bandwidth="200000">
      ...
    </Representation>
  </AdaptationSet>
  <AdaptationSet segmentAlignment="true">
    <Representation mimeType="audio/mp4" id="640x360-audio" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="48472">
      ...
    </Representation>
    <Representation mimeType="audio/mp4" id="1280x720-audio" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="48472">
      ...
    </Representation>
  </AdaptationSet>
</Period>

包含特定码率

如需按比特率过滤视频呈现，请在创建会话时在可选的 manifestOptions 字段中设置比特率。例如，如需在拼接的清单中仅显示两个比特率，请在 includeRenditions 数组中设置比特率：

{
  "manifestOptions": {
    "includeRenditions": [
      {
        "bitrateBps": 150000,
      },
      {
        "bitrateBps": 240000,
      },
    ],
  },
}

拼接后的清单中会显示以下内容：

<Period id="0" start="PT33160.000S">
  <AdaptationSet segmentAlignment="true" maxWidth="1280" maxHeight="720">
    <Representation mimeType="video/mp4" id="640x360-h264" codecs="avc1.64001E" width="640" height="360" startWithSAP="1" bandwidth="150000">
      ...
    </Representation>
    <Representation mimeType="video/mp4" id="1280x720-h264" codecs="avc1.64001E" width="1280" height="720" startWithSAP="1" bandwidth="240000">
      ...
    </Representation>
  </AdaptationSet>
  <AdaptationSet segmentAlignment="true">
    <Representation mimeType="audio/mp4" id="640x360-audio" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="48472">
      ...
    </Representation>
    <Representation mimeType="audio/mp4" id="1280x720-audio" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="48472">
      ...
    </Representation>
  </AdaptationSet>
</Period>

按比特率排序

某些播放器可能会对视频呈现顺序比较敏感。您可以将视频呈现方式的顺序设置为 ascending 或 descending，如下所示：

{
  "manifestOptions": {
    "bitrateOrder": "descending",
  },
}

拼接后的清单中会显示以下内容：

<Period id="0" start="PT33160.000S">
  <AdaptationSet segmentAlignment="true" maxWidth="1280" maxHeight="720">
    <Representation mimeType="video/mp4" id="1280x720-h264" codecs="avc1.64001E" width="1280" height="720" startWithSAP="1" bandwidth="240000">
      ...
    </Representation>
    <Representation mimeType="video/mp4" id="1280x720-h265" codecs="hvc1.1.4.L126.B0" width="1280" height="720" startWithSAP="1" bandwidth="200000">
      ...
    </Representation>
    <Representation mimeType="video/mp4" id="640x360-h264" codecs="avc1.64001E" width="640" height="360" startWithSAP="1" bandwidth="150000">
      ...
    </Representation>
    <Representation mimeType="video/mp4" id="640x360-h265" codecs="hvc1.1.4.L126.B0" width="640" height="360" startWithSAP="1" bandwidth="100000">
      ...
    </Representation>
  </AdaptationSet>
  <AdaptationSet segmentAlignment="true">
    <Representation mimeType="audio/mp4" id="640x360-audio" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="48472">
      ...
    </Representation>
    <Representation mimeType="audio/mp4" id="1280x720-audio" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="48472">
      ...
    </Representation>
  </AdaptationSet>
</Period>