設定直播活動

本頁說明如何在建立輸入端點或頻道時，設定直播功能的相關設定，例如多個音軌、字幕和圖像片集。

透過建立輸入端點進行設定

您可以在建立輸入端點時，為下列功能指定設定：

IP 許可清單

您可以指定輸入串流的 IP 範圍 (例如編碼器的 IP 位址)，藉此限制輸入端點的存取權。影片管道只會接受來自這些範圍 IP 位址的流量。IP 範圍必須採用 CIDR 區塊格式。

在 Input 資源中設定 securityRules 欄位：

{
  "type": "RTMP_PUSH",
  "securityRules": {
    "ipRanges": ["1.2.3.4/32"]
  }
}

透過建立管道設定

您可以在建立管道時，為下列功能指定設定：

多個位元率串流

您可以建立進階管道設定，支援多種位元率、解析度和影格速率。以下設定會在輸出內容中加入兩個 muxStream，一個是 360p，影格速率為 30 FPS (mux_video_360p30)，另一個是 720p，影格速率為 60 FPS (mux_video_720p60)。此設定也支援多個音訊位元速率。詳情請參閱「建議的位元率」。

{
  "inputAttachments":[
    {
      "key":"input-primary",
      "input": "projects/PROJECT_NUMBER/locations/LOCATION/inputs/INPUT_ID"
    }
  ],
  "output":{
    "uri": "gs://BUCKET_NAME"
  },
  "elementaryStreams": [
    {
      "key": "es_video_720p60",
      "videoStream": {
        "h264": {
          "profile": "high",
          "heightPixels": 720,
          "widthPixels": 1280,
          "bitrateBps": 5500000,
          "frameRate": 60
        }
      }
    },
    {
      "key": "es_video_360p30",
      "videoStream": {
        "h264": {
          "profile": "high",
          "heightPixels": 360,
          "widthPixels": 640,
          "bitrateBps": 400000,
          "frameRate": 30
        }
      }
    },
    {
      "key": "es_audio_160k",
      "audioStream": {
        "codec": "aac",
        "channelCount": 2,
        "bitrateBps": 160000
      }
    },
    {
      "key": "es_audio_64k",
      "audioStream": {
        "codec": "aac",
        "channelCount": 2,
        "bitrateBps": 64000
      }
    }
  ],
  "muxStreams": [
    {
      "key": "mux_video_720p60",
      "elementaryStreams": [
        "es_video_720p60"
      ],
      "segmentSettings": {
        "segmentDuration": "2s"
      }
    },
    {
      "key": "mux_video_360p30",
      "elementaryStreams": [
        "es_video_360p30"
      ],
      "segmentSettings": {
        "segmentDuration": "2s"
      }
    },
    {
      "key": "mux_audio_160k",
      "elementaryStreams": [
        "es_audio_160k"
      ],
      "segmentSettings": {
        "segmentDuration": "2s"
      }
    },
    {
      "key": "mux_audio_64k",
      "elementaryStreams": [
        "es_audio_64k"
      ],
      "segmentSettings": {
        "segmentDuration": "2s"
      }
    }
  ],
  "manifests": [
    {
      "key": "manifest_dash",
      "fileName": "main.mpd",
      "type": "DASH",
      "muxStreams": [
        "mux_video_720p60",
        "mux_video_360p30",
        "mux_audio_160k",
        "mux_audio_64k"
      ],
      "maxSegmentCount": 5
    },
    {
      "key": "manifest_hls",
      "fileName": "main.m3u8",
      "type": "HLS",
      "muxStreams": [
        "mux_video_720p60",
        "mux_video_360p30",
        "mux_audio_160k",
        "mux_audio_64k"
      ],
      "maxSegmentCount": 5
    }
  ]
}

多個音軌

如果輸入串流包含多個音訊軌，請使用 AudioMapping 物件為每個 AudioStream 選取音訊軌。

{
  "inputAttachments": [
    {
      "key": "MY-INPUT",
      "input": "/projects/PROJECT-ID/locations/LOCATION/inputs/MY-INPUT",
    }
  ],
  "output": {
    "uri": "gs://BUCKET_NAME/outputs/"
  },
  "elementaryStreams": [
    {
      "key": "es_video",
      "videoStream": {
        "h264": {
          "heightPixels": 720,
          "widthPixels": 1280,
          "bitrateBps": 3000000,
          "frameRate": 30
        }
      }
    },
    {
      "key": "es_first_audio",
      "audioStream": {
        "codec": "aac",
        "bitrateBps": 160000,
        "mapping": [
          {
            "inputKey": "MY-INPUT",
            "inputTrack": 1
          }
        ]
      }
    },
    {
      "key": "es_second_audio",
      "audioStream": {
        "codec": "aac",
        "bitrateBps": 160000,
        "mapping": [
          {
            "inputKey": "MY-INPUT",
            "inputTrack": 2
          }
        ]
      }
    }
  ],
  "muxStreams": [
    {
      "key": "mux_video",
      "elementaryStreams": ["es_video"],
    },
    {
      "key": "mux_first_audio",
      "elementaryStreams": ["es_first_audio"],
    },
    {
      "key": "mux_second_audio",
      "elementaryStreams": ["es_second_audio"],
    }
  ],
  "manifests": [
    {
      "key": "manifest_dash",
      "type": "DASH",
      "muxStreams": [
        "mux_video",
        "mux_first_audio",
        "mux_second_audio",
      ]
    }
  ]
}

請注意，Shaka Player 不支援以下功能，適用於含有多個音軌的 HLS 串流：

• 使用 TS 區段播放其他音訊音軌。

• 使用 fMP4 片段選取次要和替代音訊音軌。

穿透 CEA 608/708 字幕

如果輸入串流包含 CEA 608/708 字幕，您可以將字幕轉寄至輸出串流。建立 Channel 時，請將下列 textStream 新增至 elementaryStreams。這個 textStream 會在所有輸出影片串流和呈現方式中嵌入 CEA 608/708 字幕。

{
  "key": "captions",
  "textStream": {
    "codec": "cea608"
  }
}

Sprite 工作表

如要產生圖塊區塊，請在 Channel 資源中設定 spriteSheets 欄位。

{
  "spriteSheets": [
    {
      "format": "jpeg",
      "filePrefix": "sprite",
      "interval": "2s",
      "spriteWidthPixels": 320,
      "spriteHeightPixels": 240,
      "columnCount": 3,
      "rowCount": 3,
      "quality": 80
    }
  ]
}