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stb:adaptive_streaming [2018/08/06 08:44]
Alexander private:adaptive_streaming переименовано в stb:adaptive_streaming (public)
stb:adaptive_streaming [2018/08/06 08:48] (текущий)
Alexander
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-====== ​Adaptive streaming ​HLSv4 and MPEG-DASH ​on TVIPSTB ​====== +====== ​Поддержка протоколов ​HLSv4 и MPEG-DASH ​на медиацентрах TVIP ======
- +
- +
-==== HLS v4 ==== +
- +
-Initiated by using URL scheme //hlsv4// or //​hlsv4s//​.\\ +
- +
-Feature set list is based on [[https://​www.rfc-editor.org/​rfc/​rfc8216.txt|RFC8216]] \\ +
- +
-===3.1. ​ Supported Media Segment Formats === +
- +
-===3.2 MPEG-2 Transport Streams=== +
-Tested: //H.264, HEVC, AAC, AC3, MPEG Audio//​.\\ +
-Untested, but planned: //EAC3, DTS//.\\ +
-Not planned to support: //MPEG2, MPEG4//​.\\ +
-\\ +
-**EXT-X-MAP** is not supported for MPEGTS.\\ +
-TS segment should contain no more the one video and one audio track. +
- +
-===3.3 Fragmented MPEG-4=== +
-Tested: //H.264, HEVC, AAC//.\\ +
-Untested, but planned: //AC3, EAC3, DTS//.\\ +
-Planned to support: //​VP9//​.\\ +
-\\ +
-**EXT-X-MAP** is supported for initialization segment.\\ +
-fMP4 segment should contain only a single stream (audio or video)\\ +
- +
-===3.4 Packed audio=== +
-Tested: //​AAC//​.\\ +
-Planned: //AC3, EAC3.//\\ +
- +
- +
-===3.5 WebVTT=== +
-Basic support for wtt segments in VoD. +
- +
-===4.3.2 Media Segment Tags=== +
- +
-===4.3.2.1 EXTINF=== +
-Supported. +
-\\ +
-===4.3.2.2 EXT-X-BYTERANGE=== +
-Supported. +
-\\ +
-===4.3.2.3 EXT-X-DISCONTINUITY=== +
-Supported, but player reaction is limited. +
-\\ +
-===4.3.2.4 EXT-X-KEY=== +
-Supported.\\ +
-Attributes: //URI, IV, KEYFORMAT.//​ +
-AES-128 is supported.\\ +
-SAMPLE-AES is supported for MPEGTS. +
-CENC for fMP4 is planned. +
-\\ +
-===4.3.2.5 EXT-X-MAP=== +
-Supported for fMP4. Only unencrypted. +
-\\ +
-===4.3.2.6 EXT-X-PROGRAM-DATE-TIME=== +
-Supported.\\ +
-Can be used for timeshifting. +
-\\ +
-===4.3.2.7 EXT-X-DATERANGE=== +
-Not supported. +
-\\ +
- +
-===4.3.3 ​ Media Playlist Tags=== +
- +
-===4.3.3.1 EXT-X-TARGETDURATION=== +
-Supported. +
-\\ +
-===4.3.3.1 EXT-X-MEDIA-SEQUENCE=== +
-Supported. +
-\\ +
-===4.3.3.3 EXT-X-DISCONTINUITY-SEQUENCE=== +
-Supported, but player reaction is limited. +
-\\ +
-===4.3.3.4 EXT-X-ENDLIST=== +
-Supported. +
-\\ +
-===4.3.3.5 EXT-X-PLAYLIST-TYPE=== +
-Supported. +
-\\ +
-===4.3.3.6 EXT-X-I-FRAMES-ONLY=== +
-Not supported. +
-\\ +
- +
-===4.3.4 Master Playlist Tags=== +
-Supported. +
-\\ +
-===4.3.4.1 EXT-X-MEDIA=== +
-Supported.\\ +
-Valid //TYPE// values: //AUDIO, VIDEO, SUBTITLES//​.\\ +
-Supported attributes: //TYPE, URI, GROUP-ID, LANGUAGE, NAME// +
-===4.3.4.1.1 Rendition Groups=== +
-Supported.\\ +
-===4.3.4.2 EXT-X-STREAM-INF=== +
-Supported.\\ +
-Supported attributes: //​BANDWIDTH,​CODECS,​AUDIO,​VIDEO,​SUBTITLES//​. +
-\\ +
-===4.3.4.3 EXT-X-I-FRAME-STREAM-INF=== +
-Not supported.\\ +
-===4.3.4.4 EXT-X-SESSION-DATA=== +
-Not supported.\\ +
-===4.3.4.5 EXT-X-SESSION-KEY=== +
-Not supported.\\ +
- +
-===4.3.5 ​ Media or Master Playlist Tags=== +
-===4.3.5.1 ​ EXT-X-INDEPENDENT-SEGMENTS=== +
-Not supported.\\ +
-===4.3.5.2 ​ EXT-X-START=== +
-Not supported.\\ +
- +
-===6.3 Client Responsibilities=== +
-===6.3.3 ​ Playing the Media Playlist File=== +
-EXT-X-PROGRAM-DATE-TIME is only forward exterpolated. +
- +
-==== MPEG-DASH ==== +
- +
-MPEG-DASH support will be based on : [[https://​dashif.org/​wp-content/​uploads/​2017/​09/​DASH-IF-IOP-v4.1-clean.pdf|DASH-IF interop guideline]]. +
-\\ +
-Currently support is limited: +
-  * VOD profile and some subset of Live profile are supported. +
-  * Media segments should be MP4 (CMAF) with H264/H265 video and AAC/AC3 audio. WebM segment support is planned. +
-  * Media should be either splitted into file segments and use SegmentTemplate tag, either have a single segment + sidx box and use SegmentBase. SegmentList was not tested. +
-  * It is recommended that presentation has a single Period. If has multiple periods, all adaptation sets tructure should be strictly the same in all periods. Changing of media between periods is not supported. +
-  * Encryption is not supported. Widevine CDM and ClearKey CDM are planned for all S805 and S905X units. PlayReady CDM and Verimatrix is planned for special requests. +
-  * Only first available video track (adaptation set) will be selected. +
-  * Any adaptation set filtering is not supported (encrypted can be ignored, however). Audio sets will be signalled one by one. +
-  * Subtitles are not currently supported (WebVTT is planned). +
-  * Represenation set (bandwidth) switching is only possible between video adaptation sets. Audio would always use first representation set signalled. +
-  * In Live mode playlist will be updated more frequently, than it may be needed. +
-  * Any tags controlling buffering or stream priorities are not supported. +
- +
-==== Notes and known limitations === +
-    * Seeking is not limited to segment boundaries. +
-    * Video tracks can not be switched. +
-    * Switching of audio tracks may sometimes not work. +
-    * When using Flussonic, URL should be "​index.m3u8",​ not "​video.m3u8"​.+
  
 +Описание доступно на [[en:​stb:​adaptive_streaming|английском языке]].