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Frame Network 3.5

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Frame network 3.5

Microsoft .NET Framework 3.5 SP1 (Full Package)

Microsoft .NET Framework - набор библиотек и системных компонентов, которые необходимы для работы приложений, основанных на архитектуре .NET Framework.

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Руслан про Microsoft .NET Framework 3.5 SP1 (Full Package) [12-08-2014]

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Frame Network 3

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if you do not have a download manager installed, and still want to download the file(s) you've chosen, please note:

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Generally, a download manager enables downloading of large files or multiples files in one session. Many web browsers, such as Internet Explorer 9, include a download manager. Stand-alone download managers also are available, including the Microsoft Download Manager.

if you do not have a download manager installed, and still want to download the file(s) you've chosen, please note:

  • You may not be able to download multiple files at the same time. In this case, you will have to download the files individually. (You would have the opportunity to download individual files on the "Thank you for downloading" page after completing your download.)
  • Files larger than 1 GB may take much longer to download and might not download correctly.
  • You might not be able to pause the active downloads or resume downloads that have failed.

The Microsoft Download Manager solves these potential problems. It gives you the ability to download multiple files at one time and download large files quickly and reliably. It also allows you to suspend active downloads and resume downloads that have failed.

Microsoft Download Manager is free and available for download now.

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Media Source Extensions

Media Source Extensions W3C Editor's Draft 10 November 2015

This specification extends HTMLMediaElement to allow JavaScript to generate media streams for playback. Allowing JavaScript to generate streams facilitates a variety of use cases like adaptive streaming and time shifting live streams.

If you wish to make comments or file bugs regarding this document in a manner that is tracked by the editors, please submit them via our public bug database.

Status of This Document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at http://www.w3.org/TR/.

The working group maintains a list of all bug reports that the editors have not yet tried to address ; there may also be open bugs in the previous bug tracker. This draft highlights some of the pending issues that are still to be discussed in the working group. No decision has been taken on the outcome of these issues including whether they are valid.

Implementors should be aware that this specification is not stable. Implementors who are not taking part in the discussions are likely to find the specification changing out from under them in incompatible ways. Vendors interested in implementing this specification before it eventually reaches the Candidate Recommendation stage should join the mailing list mentioned below and take part in the discussions.

The following features are at risk and may be removed due to lack of implementation.

This document was published by the HTML Working Group as an Editor's Draft. If you wish to make comments regarding this document, please send them to public-html-media@w3.org (subscribe. archives ). All comments are welcome.

Publication as an Editor's Draft does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.

This document was produced by a group operating under the 5 February 2004 W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

This document is governed by the 14 October 2005 W3C Process Document.

Table of Contents 1. Introduction

This specification allows JavaScript to dynamically construct media streams for <audio> and <video>. It defines objects that allow JavaScript to pass media segments to an HTMLMediaElement [ HTML5 ]. A buffering model is also included to describe how the user agent acts when different media segments are appended at different times. Byte stream specifications used with these extensions are available in the byte stream format registry [ MSE-REGISTRY ].

This specification was designed with the following goals in mind:

  • Allow JavaScript to construct media streams independent of how the media is fetched.
  • Define a splicing and buffering model that facilitates use cases like adaptive streaming, ad-insertion, time-shifting, and video editing.
  • Minimize the need for media parsing in JavaScript.
  • Leverage the browser cache as much as possible.
  • Provide requirements for byte stream format specifications.
  • Not require support for any particular media format or codec.

This specification defines:

  • Normative behavior for user agents to enable interoperability between user agents and web applications when processing media data.
  • Normative requirements to enable other specifications to define media formats to be used within this specification.
1.2 Definitions

Active Track Buffers

Append Window

A presentation timestamp range used to filter out coded frames while appending. The append window represents a single continuous time range with a single start time and end time. Coded frames with presentation timestamp within this range are allowed to be appended to the SourceBuffer while coded frames outside this range are filtered out. The append window start and end times are controlled by the appendWindowStart and appendWindowEnd attributes respectively.

Coded Frame

Coded Frame Duration

The duration of a coded frame. For video and text, the duration indicates how long the video frame or text should be displayed. For audio, the duration represents the sum of all the samples contained within the coded frame. For example, if an audio frame contained 441 samples @44100Hz the frame duration would be 10 milliseconds.

Coded Frame End Timestamp

Coded Frame Group

A group of coded frames that are adjacent and have monotonically increasing decode timestamps without any gaps. Discontinuities detected by the coded frame processing algorithm and abort() calls trigger the start of a new coded frame group.

Decode Timestamp

The decode timestamp indicates the latest time at which the frame needs to be decoded assuming instantaneous decoding and rendering of this and any dependant frames (this is equal to the presentation timestamp of the earliest frame, in presentation order. that is dependant on this frame). If frames can be decoded out of presentation order. then the decode timestamp must be present in or derivable from the byte stream. The user agent must run the append error algorithm with the decode error parameter set to true if this is not the case. If frames cannot be decoded out of presentation order and a decode timestamp is not present in the byte stream, then the decode timestamp is equal to the presentation timestamp.

Displayed Frame Delay

The delay between a frame's presentation time and the actual time it was displayed, in a double-precision value in seconds & rounded to the nearest display refresh interval. This delay is always greater than or equal to zero since frames must never be displayed before their presentation time. Non-zero delays are a sign of playback jitter and possible loss of A/V sync.

Initialization Segment

A sequence of bytes that contain all of the initialization information required to decode a sequence of media segments. This includes codec initialization data, Track ID mappings for multiplexed segments, and timestamp offsets (e.g. edit lists).

The byte stream format specifications in the byte stream format registry [ MSE-REGISTRY ] contain format specific examples.

Media Segment

A sequence of bytes that contain packetized & timestamped media data for a portion of the media timeline. Media segments are always associated with the most recently appended initialization segment .

The byte stream format specifications in the byte stream format registry [ MSE-REGISTRY ] contain format specific examples.

MediaSource object URL

A MediaSource object URL is a unique Blob URI [ FILE-API ] created by createObjectURL(). It is used to attach a MediaSource object to an HTMLMediaElement.

These URLs are the same as a Blob URI. except that anything in the definition of that feature that refers to File and Blob objects is hereby extended to also apply to MediaSource objects.

For example, the origin of the MediaSource object URL affects the way that the media element is consumed by canvas .

Parent Media Source

The parent media source of a SourceBuffer object is the MediaSource object that created it.

Presentation Start Time

The presentation start time is the earliest time point in the presentation and specifies the initial playback position and earliest possible position. All presentations created using this specification have a presentation start time of 0.

Presentation Interval

The presentation interval of a coded frame is the time interval from its presentation timestamp to the presentation timestamp plus the coded frame's duration. For example, if a coded frame has a presentation timestamp of 10 seconds and a coded frame duration of 100 milliseconds, then the presentation interval would be [10-10.1). Note that the start of the range is inclusive, but the end of the range is exclusive.

Presentation Order

The order that coded frames are rendered in the presentation. The presentation order is achieved by ordering coded frames in monotonically increasing order by their presentation timestamps .

Presentation Timestamp

A reference to a specific time in the presentation. The presentation timestamp in a coded frame indicates when the frame must be rendered.

Random Access Point

A position in a media segment where decoding and continuous playback can begin without relying on any previous data in the segment. For video this tends to be the location of I-frames. In the case of audio, most audio frames can be treated as a random access point. Since video tracks tend to have a more sparse distribution of random access points, the location of these points are usually considered the random access points for multiplexed streams.

SourceBuffer byte stream format specification

The specific byte stream format specification that describes the format of the byte stream accepted by a SourceBuffer instance. The byte stream format specification. for a SourceBuffer object, is selected based on the type passed to the addSourceBuffer() call that created the object.

SourceBuffer configuration

A specific set of tracks distributed across one or more SourceBuffer objects owned by a single MediaSource instance.

Implementations must support at least 1 MediaSource object with the following configurations:

  • A single SourceBuffer with 1 audio track and/or 1 video track.
  • Two SourceBuffers with one handling a single audio track and the other handling a single video track.

MediaSource objects must support each of the configurations above, but they are only required to support one configuration at a time. Supporting multiple configurations at once or additional configurations is a quality of implementation issue.

Track Description

A byte stream format specific structure that provides the Track ID. codec configuration, and other metadata for a single track. Each track description inside a single initialization segment has a unique Track ID. The user agent must run the append error algorithm with the decode error parameter set to true if the Track ID is not unique within the initialization segment .

A Track ID is a byte stream format specific identifier that marks sections of the byte stream as being part of a specific track. The Track ID in a track description identifies which sections of a media segment belong to that track.

2. MediaSource Object

The MediaSource object represents a source of media data for an HTMLMediaElement. It keeps track of the readyState for this source as well as a list of SourceBuffer objects that can be used to add media data to the presentation. MediaSource objects are created by the web application and then attached to an HTMLMediaElement. The application uses the SourceBuffer objects in sourceBuffers to add media data to this source. The HTMLMediaElement fetches this media data from the MediaSource object when it is needed during playback.