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--- stb:adaptive_streaming [2018/08/06 05:44] – private:adaptive_streaming переименовано в stb:adaptive_streaming (public) Alexander
+++ stb:adaptive_streaming [2018/08/28 08:34] (текущий) – Alexander
@@ Строка 1: / Строка 1: @@
-====== Adaptive streaming HLSv4 and MPEG-DASH on TVIPSTB ======
+====== Поддержка протоколов адаптивного стимминга (HLS, 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]].