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HEVC視頻

本主題涵蓋 Video Cloud 支持HEVC視頻。

簡介

HEVC的優勢

高效視頻編碼（HEVC），也稱為H.265，是一種視頻壓縮標準，旨在作為廣泛使用的高級視頻編碼（AVC / H.264）的後繼產品。 與AVC相比，HEVC在相同視頻質量水平下可提供25％至50％的更好數據壓縮，或者在相同比特率下可顯著提高視頻質量。

這種改進的壓縮的好處包括帶寬使用，以較低的比特率實現更高的視頻質量以及縮短的第一幀時間（TTFF），所有這些都可以提高最終觀看者的滿意度。

弊端

只有一個缺點：由於它是一項新技術，因此HEVC視頻尚未得到客戶端（即設備+ OS +瀏覽器/應用程序）的廣泛支持。 另外，某些客戶端能夠在回放期間在HEVC和AVC段之間切換，而其他客戶端則不能。

可供租用日期

HEVC支持是 付費附件 用於 Video Cloud。 如果您對HEVC支持感興趣，請與您的客戶經理聯繫。

Brightcove的HEVC解決方案

為了給您帶來HEVC的好處，同時仍然允許觀眾使用不支持HEVC的技術，Brightcove開發了一種混合解決方案，既支持較舊的非HEVC客戶端，又優化了帶寬使用。 此解決方案包含多個部分：

  • 在轉碼過程中同時創建HEVC和AVC編碼的段（還可以選擇創建MP4以進行漸進式下載）
  • 生成包含所有格式的HEVC和AVC鏈接的清單：
    • HLS：混合變體流（按比特率排序）
    • DASH：用於HEVC和H.264的單獨的適應集，以及聲明它們可切換的補充屬性
  • 基於查看器客戶端類型的過濾邏輯：
    • 如果請求設備是舊版，不支持HEVC的設備，則從清單中刪除HEVC流
    • 從清單清單中刪除H.264流到支持HEVC的不可切換設備
    • 如果設備能夠解碼編解碼器並在它們之間進行切換，則將同時保留HEVC和H.264流

受支持的客戶

當前，使用Brightcove Web或本機設備在以下客戶端上端到端支持HEVC players:

HEVC支持的Web客戶端
Brightcove網站 Player
OS 瀏覽器
MacOS 10.13以上 Safari瀏覽器
iOS 11以上 Safari瀏覽器
蘋果電視 通過Airplay
窗戶10 邊緣（舊版 帶插件)
HEVC支持的設備
Brightcove本機設備SDK Players
SDK OS
iOS SDK iOS 11以上
tvOS SDK tvOS
Android的SDK Android API級別21（棒棒糖版本5.0）及更高版本 [1-1]

筆記

HEVC攝取檔案

如果為您的帳戶啟用了HEVC，則要獲取HEVC副本以進行播放，您要做的就是在使用“上傳”模塊或“ Dynamic Ingest API:

HEVC攝取檔案
HEVC攝取檔案

這些配置文件的完整JSON詳細信息已包括在內 下面。 我們建議您使用CAE（上下文感知編碼）配置文件為您的源創建最佳再現集並優化存儲。 由於CAE需要較長的處理時間來檢查源，因此，如果優先考慮盡快獲得可發布的再現文件，則可以使用 快速發布 選項。

請注意，如果出於快速發布選項或其他原因需要創建自定義HEVC配置文件，則必須使用 高級編輯 在Studio管理員頁面中，或 Ingest Profiles API。 HEVC副本不會顯示在Studio的“簡單編輯器”中。 您會找到可用的動態交付格式 下面.

限制

以下是目前對HEVC支持的限制-請注意，隨著我們進行增強，這些限制將會改變。

  • CAE攝取配置文件當前包含HEVC格式說明-僅在您知道僅將視頻傳遞到支持HEVC的設備的情況下，才應使用這些格式。 將來的版本將添加包含HEVC和AVC演繹版本的配置文件。
  • 在初始版本中，不支持使用Android SDK構建的應用。 這將在將來的版本中添加。
  • 僅支持AAC音頻，不支持帶有HEVC的EAC3或AC3音頻編解碼器。
  • 不支持HDR和10位視頻。
  • Media UI當前顯示所有格式，並且不在每個格式旁邊顯示編解碼器信息。
  • Studio中的帳單用戶界面不會顯示HEVC轉碼用法。 但是，後端系統將單獨跟踪HEVC GB，並將作為正常流程的一部分發送發票。 計費用戶界面將在以後的版本中更新。

附錄1：HEVC攝取配置文件

以下是JSON中HEVC配置文件的完整屬性。

上下文感知編碼（CAE）配置文件

多平台擴展HEVC（CAE）

  {
      "version": 1,
      "name": "multi-platform-extended-dynamic-hevc",
      "display_name": "Multiplatform Extended HEVC (CAE)",
      "description": "Deliver high quality content for a wide range content types and screen sizes including mobile, desktop and large screens.",
      "account_id": -1,
      "brightcove_standard": true,
      "date_created": 1581706195164,
      "date_last_modified": 1581706195164,
      "digital_master": {
        "rendition": "passthrough",
        "distribute": false
      },
      "renditions": [
        
      ],
      "packages": [
        
      ],
      "dynamic_origin": {
        "renditions": [
          "default/audio64",
          "default/audio128",
          "default/audio96",
          "default/audio192"
        ],
        "images": [
          {
            "label": "thumbnail",
            "height": 90,
            "width": 160
          },
          {
            "label": "poster",
            "height": 720,
            "width": 1280
          }
        ],
        "dynamic_profile_options": {
          "min_renditions": 2,
          "max_renditions": 8,
          "min_resolution": {
            "width": 320,
            "height": 180
          },
          "max_resolution": {
            "width": 1920,
            "height": 1080
          },
          "max_frame_rate": 30,
          "max_bitrate": 4200,
          "max_first_rendition_bitrate": 250,
          "video_codec": "hevc",
          "fixed_frame_rate": true,
          "bitrate_cap_to_bitrate_ratio": 1.5,
          "buffer_size_to_bitrate_ratio": 2,
          "bitrate_cap_offset": 0,
          "buffer_size_offset": 0,
          "sample_aspect_ratio": "1:1"
        },
        "hevc": true
      },
      "id": "5e470e014b23617ad079c486"
    }

帶有MP4的多平台擴展HEVC（CAE）

{
      "version": 1,
      "name": "multi-platform-extended-dynamic-hevc-with-mp4",
      "display_name": "Multiplatform Extended HEVC (CAE) with MP4",
      "description": "Deliver high quality content for a wide range content types and screen sizes including mobile, desktop, large screens, and syndication.",
      "account_id": -1,
      "brightcove_standard": true,
      "date_created": 1581706195164,
      "date_last_modified": 1581706195164,
      "digital_master": {
        "rendition": "passthrough",
        "distribute": false
      },
      "renditions": [
        
      ],
      "packages": [
        
      ],
      "dynamic_origin": {
        "renditions": [
          "default/audio64",
          "default/audio128",
          "default/progressive2000",
          "default/audio96",
          "default/audio192"
        ],
        "images": [
          {
            "label": "thumbnail",
            "height": 90,
            "width": 160
          },
          {
            "label": "poster",
            "height": 720,
            "width": 1280
          }
        ],
        "dynamic_profile_options": {
          "min_renditions": 2,
          "max_renditions": 8,
          "min_resolution": {
            "width": 320,
            "height": 180
          },
          "max_resolution": {
            "width": 1920,
            "height": 1080
          },
          "max_frame_rate": 30,
          "max_bitrate": 4200,
          "max_first_rendition_bitrate": 250,
          "video_codec": "hevc",
          "fixed_frame_rate": true,
          "bitrate_cap_to_bitrate_ratio": 1.5,
          "buffer_size_to_bitrate_ratio": 2,
          "bitrate_cap_offset": 0,
          "buffer_size_offset": 0,
          "sample_aspect_ratio": "1:1"
        },
        "hevc": true
      },
      "id": "5e470e0c4c881c16fffdb88d"
    }

動態交付資料

多平台擴展靜態H.264 + HEVC

{
      "version": 1,
      "name": "multi-platform-extended-static-mixed-codec",
      "display_name": "Multiplatform Extended Static H.264 + HEVC",
      "description": "Deliver high quality content for a wide range content types and screen sizes including mobile, desktop and large screens.",
      "account_id": -1,
      "brightcove_standard": true,
      "date_created": 1581706195164,
      "date_last_modified": 1581706195164,
      "digital_master": {
        "rendition": "passthrough",
        "distribute": false
      },
      "renditions": [
        
      ],
      "packages": [
        
      ],
      "dynamic_origin": {
        "renditions": [
          "default/video1600hevc",
          "default/audio128",
          "default/video550hevc",
          "default/video1000hevc",
          "default/video300hevc",
          "default/video700",
          "default/video3500",
          "default/video2000",
          "default/video2500",
          "default/video2850hevc",
          "default/video450",
          "default/video900",
          "default/audio64",
          "default/video3800",
          "default/audio96",
          "default/video1200",
          "default/video1300hevc",
          "default/audio192"
        ],
        "images": [
          {
            "label": "thumbnail",
            "height": 90,
            "width": 160
          },
          {
            "label": "poster",
            "height": 720,
            "width": 1280
          }
        ],
        "hevc": true
      },
      "id": "5e46e57f305eb2517f27a543"
    }

帶有MP264的多平台擴展靜態H.4 + HEVC

{
      "version": 1,
      "name": "multi-platform-extended-static-mixed-codec-with-mp4",
      "display_name": "Multiplatform Extended Static H.264 + HEVC with MP4",
      "description": "Deliver high quality content for a wide range content types and screen sizes including mobile, desktop and large screens, and syndication.",
      "account_id": -1,
      "brightcove_standard": true,
      "date_created": 1581706195164,
      "date_last_modified": 1581706195164,
      "digital_master": {
        "rendition": "passthrough",
        "distribute": false
      },
      "renditions": [
        
      ],
      "packages": [
        
      ],
      "dynamic_origin": {
        "renditions": [
          "default/video1600hevc",
          "default/audio128",
          "default/video550hevc",
          "default/video1000hevc",
          "default/video300hevc",
          "default/video700",
          "default/progressive2000",
          "default/video3500",
          "default/video2000",
          "default/video2500",
          "default/video2850hevc",
          "default/video450",
          "default/video900",
          "default/audio64",
          "default/video3800",
          "default/audio96",
          "default/video1200",
          "default/video1300hevc",
          "default/audio192"
        ],
        "images": [
          {
            "label": "thumbnail",
            "height": 90,
            "width": 160
          },
          {
            "label": "poster",
            "height": 720,
            "width": 1280
          }
        ],
        "hevc": true
      },
      "id": "5e46e59b135b6662f386559d"
    }

帶有MP4的多平台擴展HEVC

{
      "version": 1,
      "name": "multi-platform-extended-static-hevc-with-mp4",
      "display_name": "Multiplatform Extended HEVC with MP4",
      "description": "Deliver high quality content for a wide range content types and screen sizes including mobile, desktop, large screens, and syndication.",
      "account_id": -1,
      "brightcove_standard": true,
      "date_created": 1581706195164,
      "date_last_modified": 1581706195164,
      "digital_master": {
        "rendition": "passthrough",
        "distribute": false
      },
      "renditions": [
        
      ],
      "packages": [
        
      ],
      "dynamic_origin": {
        "renditions": [
          "default/audio64",
          "default/video1600hevc",
          "default/audio128",
          "default/video550hevc",
          "default/video1000hevc",
          "default/video300hevc",
          "default/progressive2000",
          "default/video2850hevc",
          "default/audio96",
          "default/video1300hevc",
          "default/audio192"
        ],
        "images": [
          {
            "label": "thumbnail",
            "height": 90,
            "width": 160
          },
          {
            "label": "poster",
            "height": 720,
            "width": 1280
          }
        ],
        "hevc": true
      },
      "id": "5e46e57e708a441e00a7ba1a"
    }

附錄2：HEVC動態傳送格式

以下是JSON中HEVC格式的完整屬性。

默認HEVC 300

{
      "id": "default/video300hevc",
      "version": 0,
      "name": "Default HEVC 300",
      "kind": "video",
      "account_id": "default",
      "created_at": "2020-02-20T17:57:49.622898302Z",
      "updated_at": "2020-02-20T17:57:49.622898302Z",
      "encoding_settings": {
        "aspect_mode": "preserve",
        "decoder_bitrate_cap": 450,
        "decoder_buffer_size": 600,
        "fixed_keyframe_interval": true,
        "fragment_duration": 2000,
        "height": 270,
        "keyframe_rate": 1,
        "segment_seconds": 2,
        "speed": 3,
        "video_bframes": 3,
        "video_bitrate": 300,
        "video_codec": "hevc",
        "video_codec_profile": "main",
        "video_reference_frames": 6,
        "width": 480
      }
    }

默認HEVC 550

{
      "id": "default/video550hevc",
      "version": 0,
      "name": "Default HEVC 550",
      "kind": "video",
      "account_id": "default",
      "created_at": "2020-02-20T17:58:08.602132077Z",
      "updated_at": "2020-02-20T17:58:08.602132077Z",
      "encoding_settings": {
        "aspect_mode": "preserve",
        "decoder_bitrate_cap": 825,
        "decoder_buffer_size": 1100,
        "fixed_keyframe_interval": true,
        "fragment_duration": 2000,
        "height": 360,
        "keyframe_rate": 1,
        "segment_seconds": 2,
        "speed": 3,
        "video_bframes": 3,
        "video_bitrate": 550,
        "video_codec": "hevc",
        "video_codec_profile": "main",
        "video_reference_frames": 6,
        "width": 640
      }
    }

默認HEVC 1000

{
      "id": "default/video1000hevc",
      "version": 0,
      "name": "Default HEVC 1000",
      "kind": "video",
      "account_id": "default",
      "created_at": "2020-02-20T17:58:24.768036423Z",
      "updated_at": "2020-02-20T17:58:24.768036423Z",
      "encoding_settings": {
        "aspect_mode": "preserve",
        "decoder_bitrate_cap": 1500,
        "decoder_buffer_size": 2000,
        "fixed_keyframe_interval": true,
        "fragment_duration": 2000,
        "height": 432,
        "keyframe_rate": 1,
        "segment_seconds": 2,
        "speed": 3,
        "video_bframes": 3,
        "video_bitrate": 1000,
        "video_codec": "hevc",
        "video_codec_profile": "main",
        "video_reference_frames": 6,
        "width": 768
      }
    }

默認HEVC 1300

{
      "id": "default/video1300hevc",
      "version": 0,
      "name": "Default HEVC 1300",
      "kind": "video",
      "account_id": "default",
      "created_at": "2020-02-20T17:58:51.222403657Z",
      "updated_at": "2020-02-20T17:58:51.222403657Z",
      "encoding_settings": {
        "aspect_mode": "preserve",
        "decoder_bitrate_cap": 1950,
        "decoder_buffer_size": 2600,
        "fixed_keyframe_interval": true,
        "fragment_duration": 2000,
        "height": 576,
        "keyframe_rate": 1,
        "segment_seconds": 2,
        "speed": 3,
        "video_bframes": 3,
        "video_bitrate": 1300,
        "video_codec": "hevc",
        "video_codec_profile": "main",
        "video_reference_frames": 6,
        "width": 1024
      }
    }

默認HEVC 1600

{
      "id": "default/video1600hevc",
      "version": 0,
      "name": "Default HEVC 1600",
      "kind": "video",
      "account_id": "default",
      "created_at": "2020-02-20T18:00:00.347383018Z",
      "updated_at": "2020-02-20T18:00:00.347383018Z",
      "encoding_settings": {
        "aspect_mode": "preserve",
        "decoder_bitrate_cap": 2400,
        "decoder_buffer_size": 3200,
        "fixed_keyframe_interval": true,
        "fragment_duration": 2000,
        "height": 720,
        "keyframe_rate": 1,
        "segment_seconds": 2,
        "speed": 3,
        "video_bframes": 3,
        "video_bitrate": 1600,
        "video_codec": "hevc",
        "video_codec_profile": "main",
        "video_reference_frames": 6,
        "width": 1280
      }
    }

默認HEVC 2850

{
      "id": "default/video2850hevc",
      "version": 0,
      "name": "Default HEVC 2850",
      "kind": "video",
      "account_id": "default",
      "created_at": "2020-02-20T18:00:42.036123319Z",
      "updated_at": "2020-02-20T18:00:42.036123319Z",
      "encoding_settings": {
        "aspect_mode": "preserve",
        "decoder_bitrate_cap": 4275,
        "decoder_buffer_size": 5700,
        "fixed_keyframe_interval": true,
        "fragment_duration": 2000,
        "height": 1080,
        "keyframe_rate": 1,
        "segment_seconds": 2,
        "speed": 3,
        "video_bframes": 3,
        "video_bitrate": 2850,
        "video_codec": "hevc",
        "video_codec_profile": "main",
        "video_reference_frames": 6,
        "width": 1920
      }
    }
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