Multi-audio track transcoding and packaging-Intelligent Media Services(IMS)-阿里云帮助中心

Transcoding and packaging workflow

Example of a packaged file structure:

#EXTM3U

# Audio stream definitions (multi-language)
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",NAME="Chinese",LANGUAGE="zh",DEFAULT=YES,URI="audio/chinese.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",NAME="English",LANGUAGE="en",DEFAULT=NO,URI="audio/english.m3u8"

# Video stream definitions (multi-bitrate)
#EXT-X-STREAM-INF:BANDWIDTH=400000,RESOLUTION=360x640,AUDIO="audio",CODECS="hvc1,mp4a.40.5"
video/360p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=900000,RESOLUTION=720x1280,AUDIO="audio",CODECS="hvc1,mp4a.40.5"
video/720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=2000000,RESOLUTION=1080x1920,AUDIO="audio",CODECS="hvc1,mp4a.40.5"
video/1080p.m3u8

Prerequisites

Ensure Intelligent Media Services (IMS) is activated. For instructions, see Activate IMS.

Configuration

Basic IMS configuration

Storage: Bind an Object Storage Service (OSS) bucket to IMS. For more information, see Configure a storage location.
Callbacks: Configure an HTTP or MNS callback to receive task status notifications. For more information, see Callback events overview.

Transcoding template configuration

Configuration procedure

Example requirements

Codec: H.264/H.265

Video resolution: 360p/540p/720p/1080p

Audio: HE-AAC at 64 kbps (default configuration).

Example configuration

Create transcoding templates for each required video resolution based on the following tables. For instructions, see Create a transcoding template.

Note

To perform Narrowband HD™ transcoding, create the corresponding templates based on the table, and then submit a ticket for Alibaba Cloud to upgrade your backend configuration.

H.264

Transcoding template	Codec	Container format	Other settings
Video-360P	H.264	m3u8(.ts)	Resolution (long edge fixed, short edge adaptive): 640* Disable audio Segment length: 5 s Configure other settings as needed.
Video-540P	H.264	m3u8(.ts)	Resolution (long edge fixed, short edge adaptive): 960* Disable audio Segment length: 5 s Configure other settings as needed.
Video-720P	H.264	m3u8(.ts)	Resolution (long edge fixed, short edge adaptive): 1280* Disable audio Segment length: 5 s Configure other settings as needed.
Video-1080P	H.264	m3u8(.ts)	Resolution (long edge fixed, short edge adaptive): 1920* Disable audio Segment length: 5 s Configure other settings as needed.
Audio-64Kbps	HE-AAC	m3u8(.ts)	Disable video Segment length: 5 s Note This template cannot be created in the console. Use the API or submit a ticket instead.

H.265

Note

Recommended: Use the fmp4 container format. It is the standard for Apple devices and is compatible with Safari.
Alternative: The .ts container format can also be used, but it is not compatible with Safari.
Console limitation: You cannot create a stream with the fmp4 container format in the console. Instead, create the stream with the m3u8(ts) container format. Alibaba Cloud will then upgrade the configuration in the backend.

Transcoding template	Codec	Container format	Other settings
Video-360P	H.265	m3u8(.fmp4)	Resolution (long edge fixed, short edge adaptive): 640* Disable audio Segment length: 5 s Configure other settings as needed.
Video-540P	H.265	m3u8(.fmp4)	Resolution (long edge fixed, short edge adaptive): 960* Disable audio Segment length: 5 s Configure other settings as needed.
Video-720P	H.265	m3u8(.fmp4)	Resolution (long edge fixed, short edge adaptive): 1280* Disable audio Segment length: 5 s Configure other settings as needed.
Video-1080P	H.265	m3u8(.fmp4)	Resolution (long edge fixed, short edge adaptive): 1920* Disable audio Segment length: 5 s Configure other settings as needed.
Audio-64Kbps	HE-AAC	m3u8(.fmp4)	Disable video Segment length: 5 s Note This template cannot be created in the console. Use the API or submit a ticket instead.

Multi-bitrate transcoding and packaging task

Multi-bitrate task submission

Call the SubmitMediaConvertJob operation to submit a transcoding task for your media files.

HlsGroupConfig parameters

Parameter	Type	Description
Type	string	The type of the data stream. Valid values: video: a video stream. Only video-related settings are processed. audio: an audio stream. Only audio-related settings are processed. hybrid: a hybrid stream. Both audio and video-related settings are processed.
Bandwidth	string	The bandwidth. This parameter is optional. By default, the bitrate (in bps) is used. Valid only when `Type` is set to `video` or `hybrid`.
AudioGroup	string	The audio group referenced by the video stream. Valid only when `Type` is set to `video`.
SubtitleGroup	string	The subtitle group referenced by the video stream. Valid only when `Type` is set to `video` or `hybrid`.
Name	string	The NAME attribute of the output stream in the HLS manifest. This parameter is required when `Type` is set to `audio` or `subtitle`.
Group	string	The GROUP_ID attribute of the output stream in the HLS manifest. This parameter is valid only when `Type` is set to `audio` or `subtitle`. Defaults to the value of the `Type` parameter.
Language	string	The LANGUAGE attribute of the output stream in the HLS manifest. This parameter is valid only when `Type` is set to `audio` or `subtitle`. The value must conform to RFC 5646.
Default	boolean	Specifies whether this is the default stream. Valid only when `Type` is set to `audio`.
AutoSelect	boolean	Specifies whether the stream should be automatically selected. Valid only when `Type` is set to `audio`.
Forced	boolean	Specifies whether the stream is forced. Valid only when `Type` is set to `audio`.

Use case 1: Transcode and package

{
  "Inputs": [
    {
      "Name": "video",
      "InputFile": {
        "Type": "OSS",
        "Media": "https://<your-bucket>.<public-endpoint>/<video_1_chinese.mp4>"
      }
    },
    {
      "Name": "EnglishAudio",
      "InputFile": {
        "Type": "OSS",
        "Media": "https://<your-bucket>.<public-endpoint>/<video_1_english.mp4>"
      }
    },
    {
      "Name": "JapaneseAudio",
      "InputFile": {
        "Type": "OSS",
        "Media": "https://<your-bucket>.<public-endpoint>/<video_1_japanese.mp4>"
      }
    }
  ],
  "OutputGroups": [
    {
      "GroupConfig": {
        "Type": "Hls",
        "OutputFileBase": {
          "Type": "OSS",
          "Media": "https://<your-bucket>.<public-endpoint>/<URI>/"
        },
        "ManifestName": "<m3u8_filename>"
      },
      "Outputs": [
        {
          "Name": "360P",
          "InputRef": "video",
          "OutputFileName": "video/360p/360p",
          "TemplateId": "Video-360P"
        },
        {
          "Name": "540P",
          "InputRef": "video",
          "OutputFileName": "video/540p/540p",
          "TemplateId": "Video-540P"
        },
        {
          "Name": "720P",
          "InputRef": "video",
          "OutputFileName": "video/720p/720p",
          "TemplateId": "Video-720P"
        },
        {
          "Name": "1080P",
          "InputRef": "video",
          "OutputFileName": "video/1080p/1080p",
          "TemplateId": "Video-1080P"
        },
        {
          "OutputFileName": "audio/chinese/chinese",
          "TemplateId": "Audio-64Kbps",
          "HlsGroupConfig": {
            "Name": "Chinese",
            "Type":"audio",
            "Language": "zh",
            "Autoselect": "TRUE",
            "Default": "TRUE"
          }
        },
        {
          "InputRef": "EnglishAudio",
          "OutputFileName": "audio/english/english",
          "TemplateId": "Audio-64Kbps",
          "HlsGroupConfig": {
            "Name": "English",
            "Type":"audio",
            "Language": "en",
            "Autoselect": "TRUE"
          }
        },
        {
          "InputRef": "JapaneseAudio",
          "OutputFileName": "audio/japanese/japanese",
          "TemplateId": "Audio-64Kbps",
          "HlsGroupConfig": {
            "Name": "Japanese",
            "Type":"audio",
            "Language": "ja",
            "Autoselect": "TRUE"
                    }
                }
            ]
        }
    ]
}

Use case 2: Add audio tracks

Procedure:

Specify an input named "ExtraAudio". In the output, reference this input to transcode it into an audio HLS stream.
Set InputRef in the ManifestExtend option of GroupConfig to reference the "RefManifest" file from the input, reusing the original manifest to add extra audio tracks.

{
  "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": "#YourAudioTemplateId",
          "hlsGroupConfig": {
            "Type": "audio",
            "Name":"Chinese",
            "Language": "zh-cn"
          }
        }
      ]
    }
  ]
}

Use case 3: Replace audio tracks

This use case builds on Use case 2. Use the Excludes option within ManifestExtend to exclude specific streams from the original manifest.

Parameter	Type	Description
Name	string	The `NAME` attribute of the stream to exclude.
Type	string	The `TYPE` attribute of the stream to exclude. Valid values: Audio Subtitle
Language	string	The `LANGUAGE` attribute of the stream to exclude. The value must conform to RFC 5646.

{
  "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": "#YourAudioTemplateId",
          "hlsGroupConfig": {
            "Type": "audio",
            "Name":"Chinese",
            "Language": "zh-cn"
          }
        }
      ]
    }
  ]
}

Querying task results

Call the GetMediaConvertJob operation to query the details of a transcoding task.

Callback notifications

Event type: MediaConvertComplete

This event cannot be configured in the console. Call the SetEventCallback operation instead.

Key callback parameters

Parameter	Type	Required	Description
Name	String	Yes	The name of the main task.
JobId	String	Yes	The task ID.
Status	String	Yes	The task status. `Success` indicates that at least one output (subtask) succeeded.
TriggerSource	String	No	The source that triggered the task. `API` indicates the task was submitted via an API call.
FinishTime	String	No	The time the task was completed. The format must match `EventTime`.
UserData	string	No	The custom string specified when you submitted the task. This value is passed through and returned in the callback.

Example

{
	"FinishTime": "2025-05-09T08:03:21Z",
	"JobId": "your-job-id",
	"Status": "Success",
	"TriggerSource": "IceWorkflow",
	"UserData": "{\"ImsSrc\":\"Workflow\",\"TaskId\":\"e89a955d88ca47f0b9b79c562e5c622f\"}"
}

Playing the multi-bitrate packaged video

Use ApsaraVideo Player to play the packaged multi-bitrate video.

Video translation and multi-bitrate packaging workflow

Prepare inputs: Provide the source file.
Translate: Translate the source file into the target languages, such as English and Japanese, to generate the corresponding audio or video files.
Transcode and package: Call the SubmitMediaConvertJob operation to merge the multi-language content and transcode it into a standardized, multi-bitrate video.