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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,是對廣泛使用的視頻標準 高級視頻編碼(AVC / H.264)。 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減少帶寬使用,以較低的比特率實現更高的視頻質量,以及縮短到第一幀的時間(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 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,同時仍允許觀看者使用不支持HEVC的技術,Brightcove開發了一種全面的解決方案,既支持較舊的非HEVC客戶端,也優化了帶寬使用。 此解決方案包含多個部分:

    • 在轉碼過程中同時創建HEVC和AVC編碼的演繹文件(還可以選擇創建MP4以進行漸進式下載)
    • 包含對HEVC和AVC演繹的引用的清單的生成:
      • 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
      • 如果設備能夠解碼兩個編解碼器並在它們之間進行切換,則將保留HEVC和H.264流的最佳子集

    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.

    自定義CAE配置文件

    標準CAE攝取配置文件不包括混合的HEVC / H.264再現。 但是,您可以創建一個自定義主題。 目前,您必須使用 Ingest Profiles API 為HEVC創建這些自定義CAE配置文件。

    字段(下 dynamic_origin > dynamic_profile_options)必不可少的是:

    video_codecs
    為其創建演繹的編解碼器數組。 當前僅支持編解碼器值 h264hevc
    video_codec_options
    video_codecs中指定的每個編解碼器的輸出選項。 的屬性 video_codec_options 是具有包含的編解碼器名稱(當前為h264或hevc)的對象。 每個對象的允許屬性為
    • min_renditions 必須要戴上
    • max_bitrate
    • max_first_rendition_bitrate
    • min_resolution
    • max_resolution
    • max_first_rendition_resolution

    樣本

    以下是具有混合格式的樣本CAE配置文件:

    {
      "name": "multi-platform-extended-dynamic-hevc-mixed-codec",
      "display_name": "Multiplatform Extended HEVC (CAE) mixed-codec",
      "description": "Deliver high quality content for a wide range content types and screen sizes including mobile, desktop and large screens.",
      "account_id": 1486906377,
      "digital_master": {
        "rendition": "passthrough",
        "distribute": false
      },
      "renditions": [],
      "packages": [],
      "dynamic_origin": {
        "renditions": [
          "default/audio64",
          "default/audio128",
        ],
        "images": [
          {
            "label": "thumbnail",
            "height": 90,
            "width": 160
          },
          {
            "label": "poster",
            "height": 720,
            "width": 1280
          }
        ],
        "dynamic_profile_options": {
          "max_renditions": 10,
          "min_renditions": 2,
          "max_bitrate": 12000,
          "max_first_rendition_bitrate": 1000,
          "max_first_rendition_resolution": {
            "width": 1280,
            "height": 720
          },
          "video_codecs": [
            "h264",
            "hevc"
          ],
          "video_codec_options": {
            "h264": {
              "min_renditions": 2,
              "max_resolution": {
                "width": 1280,
                "height": 720
              }
            },
            "hevc": {
              "min_renditions": 2,
              "max_resolution": {
                "width": 1920,
                "height": 1080
              }
            }
          }
        }
      }
    }

    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。

    1. 目前,標準CAE攝取配置文件包括HEVC格式說明-僅應在您知道僅將視頻傳遞到支持HEVC的設備的情況下使用。 可以創建自定義配置文件,以包含HEVC和H.264格式。 見 自定義CAE配置文件 以上部分。
    2. 僅支持AAC音頻,不支持帶有HEVC的EAC3或AC3音頻編解碼器。
    3. 不支持HDR和10位視頻。
    4. 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。

    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"
            ],
            "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"
            ],
            "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": 3200,
              "max_first_rendition_bitrate": 200,
              "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/video450",
              "default/video700",
              "default/video900",
              "default/video1200",
              "default/video2000",
              "default/video2500",
              "default/video3500",
              "default/video3800",
              "default/video300hevc",
              "default/video550hevc",
              "default/video1000hevc",
              "default/video1300hevc",
              "default/video1600hevc",
              "default/video2850hevc",
              "default/audio64",
              "default/audio128"
            ],
            "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/video450",
              "default/video700",
              "default/video900",
              "default/video1200",
              "default/video2000",
              "default/video2500",
              "default/video3500",
              "default/video3800",
              "default/video300hevc",
              "default/video550hevc",
              "default/video1000hevc",
              "default/video1300hevc",
              "default/video1600hevc",
              "default/video2850hevc",
              "default/progressive2000",
              "default/audio64",
              "default/audio128"
            ],
            "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/video300hevc",
              "default/video550hevc",
              "default/video1000hevc",
              "default/video1300hevc",
              "default/video1600hevc",
              "default/video2850hevc",
              "default/progressive2000",
              "default/audio64",
              "default/audio128"
            ],
            "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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