Intelligent Media Services：多音軌轉碼打包最佳實務

情境1：轉碼並產生多碼率打包檔案

{
  "Inputs": [
    {
      "Name": "video",
      "InputFile": {
        "Type": "OSS",
        "Media": "https://<Bucket>.<外網Endpoint>/<視頻1中文>"
      }
    },
    {
      "Name": "EnglishAudio",
      "InputFile": {
        "Type": "OSS",
        "Media": "https://<Bucket>.<外網Endpoint>/<視頻1英文>"
      }
    },
    {
      "Name": "JapaneseAudio",
      "InputFile": {
        "Type": "OSS",
        "Media": "https://<Bucket>.<外網Endpoint>/<視頻1日語>"
      }
    }
  ],
  "OutputGroups": [
    {
      "GroupConfig": {
        "Type": "Hls",
        "OutputFileBase": {
          "Type": "OSS",
          "Media": "https://<Bucket>.<外網Endpoint>/<URI>/"
        },
        "ManifestName": "<m3u8filename>"
      },
      "Outputs": [
        {
          "Name": "360P",
          "InputRef": "video",
          "OutputFileName": "video/360p/360p",
          "TemplateId": "視頻-360P"
        },
        {
          "Name": "540P",
          "InputRef": "video",
          "OutputFileName": "video/540p/540p",
          "TemplateId": "視頻-540P"
        },
        {
          "Name": "720P",
          "InputRef": "video",
          "OutputFileName": "video/720p/720p",
          "TemplateId": "視頻-720P"
        },
        {
          "Name": "1080P",
          "InputRef": "video",
          "OutputFileName": "video/1080p/1080p",
          "TemplateId": "視頻-1080P"
        },
        {
          "OutputFileName": "audio/chinese/chinese",
          "TemplateId": "音頻-64Kbps",
          "HlsGroupConfig": {
            "Name": "Chinese",
            "Type":"audio",
            "Language": "zh",
            "Autoselect": "TRUE",
            "Default": "TRUE"
          }
        },
        {
          "InputRef": "EnglishAudio",
          "OutputFileName": "audio/english/english",
          "TemplateId": "音頻-64Kbps",
          "HlsGroupConfig": {
            "Name": "English",
            "Type":"audio",
            "Language": "en",
            "Autoselect": "TRUE"
          }
        },
        {
          "InputRef": "JapaneseAudio",
          "OutputFileName": "audio/japanese/japanese",
          "TemplateId": "音頻-64Kbps",
          "HlsGroupConfig": {
            "Name": "Japanese",
            "Type":"audio",
            "Language": "ja",
            "Autoselect": "TRUE"
                    }
                }
            ]
        }
    ]
}

情境2：在原 hls manifest 基礎上增加音軌

配置步驟：

1. 指定了名為“ExtraAudio”的輸入。並在輸出中引用該輸入以轉碼為音頻 HLS 流。

2. 在 GroupConfig 中的 ManifestExtend 選項中設定 InputRef，以引用輸入中的 "RefManifest" 檔案，從而複用 manifest，實現基於原 manifest 增加額外音軌的目的。

{
  "Inputs": [
    {
      "Name": "ExtraAudio",
      "InputFile": {
        "Type": "OSS",
        "Media": "http://your-bucket.oss-region.aliyuncs.com/in/extra-audio.mp4"
      }
    },
    {
      "Name": "RefManifest",
      "InputFile": {
        "Type": "OSS",
        "Media": "http://your-bucket.oss-region.aliyuncs.com/in/manifest.m3u8"
      }
    }
  ],
  "OutputGroups": [
    {
      "GroupConfig": {
        "Type": "Hls",
        "OutputFileBase": {
          "Type": "OSS",
          "Media": "http://your-bucket.oss-region.aliyuncs.com/out/demo"
        },
        "ManifestName": "manifest",
        "ManifestExtend": {
          "InputRef": "RefManifest"
        }
      },
      "Outputs": [
        {
          "Name": "ExtraAudioOut",
          "InputRef": "ExtraAudio",
          "OutputFileName": "extra-audio",
          "TemplateId": "#音頻模板Id",
          "hlsGroupConfig": {
            "Type": "audio",
            "Name":"Chinese",
            "Language": "zh-cn"
          }
        }
      ]
    }
  ]
}

情境3：在原 hls manifest 基礎上音軌替換

在情境2的基礎上，在 ManifestExtend 中增加 “Excludes” 選項，以排除原始manifest中的一些流。

{
  "Inputs": [
    {
      "Name": "ExtraAudio",
      "InputFile": {
        "Type": "OSS",
        "Media": "http://your-bucket.oss-region.aliyuncs.com/in/extra-audio.mp4"
      }
    },
    {
      "Name": "RefManifest",
      "InputFile": {
        "Type": "OSS",
        "Media": "http://your-bucket.oss-region.aliyuncs.com/in/manifest.m3u8"
      }
    }
  ],
  "OutputGroups": [
    {
      "GroupConfig": {
        "Type": "Hls",
        "OutputFileBase": {
          "Type": "OSS",
          "Media": "http://your-bucket.oss-region.aliyuncs.com/out/demo"
        },
        "ManifestName": "manifest",
        "ManifestExtend": {
          "InputRef": "RefManifest",
          "Excludes": [{
              "Language": "en",
              "Type": "Audio"
            }]
        }
      },
      "Outputs": [
        {
          "Name": "ExtraAudioOut",
          "InputRef": "ExtraAudio",
          "OutputFileName": "extra-audio",
          "TemplateId": "#音頻模板Id",
          "hlsGroupConfig": {
            "Type": "audio",
            "Name":"Chinese",
            "Language": "zh-cn"
          }
        }
      ]
    }
  ]
}