CN105721952A

CN105721952A - Live streaming network transmission method and system for equal-length slices

Info

Publication number: CN105721952A
Application number: CN201610052901.4A
Authority: CN
Inventors: 杨成立; 雷健; 杨默涵
Original assignee: Concept Of Cloud (beijing) Information Technology Co Ltd
Current assignee: Concept Of Cloud (beijing) Information Technology Co Ltd
Priority date: 2016-01-27
Filing date: 2016-01-27
Publication date: 2016-06-29

Abstract

The invention provides a live streaming network transmission method and system for equal-length slices. The system comprises a streaming media server for slicing a video stream into the equal-length slices according to an absolute timestamp, and a corresponding special purpose terminal player. According to the method, a non-indexed equal-length slicing technology is utilized to perform equal-length slicing on the video stream according to the absolute timestamp to obtain the equal-length slices, the equal-length slices are saved, a file is named according to the absolute timestamp, and the player can automatically calculate a URL of a required sliced file through time calibration between the player and a server. According to the non-indexed equal-length slicing technology, regular refreshing of a list file from a source station is not required, a request of an index file is eliminated, the response speed is greatly improved, and the server load is effectively reduced.

Description

A kind of live TV stream network transfer method waiting duration section and system

Technical field

The present invention relates to stream media technology field, specifically, particularly relate to the method and system of a kind of Streaming Media section.

Background technology

In recent years, in Streaming Media field, video flowing is extensively taken slicing mode and processes, for instance the HLS protocol of Fructus Mali pumilae, the HDS agreement of Adobe, the SmoothStreaming of Microsoft, most widely used is exactly HLS protocol at present.For live application, it is simple to carry out time shifting broadcasting.And adopt HTTP transmission section, convenient deployment, facilitate CDN buffered video.

Above-mentioned agreement is desirable that and often a piece of can all independently decode, and the first namely often a piece of frame is all key frame, and the duration of so each section will not be completely the same, so needing to provide a playlist for each program.

These protocol requirements are one group of duration and the close media file (calling section) of size video flowing cutting, form a playlist for these media files simultaneously, and playlist is actually duration and the url list of a section.Cutting into slices and store with document form, during broadcasting, first terminal downloads playlist, downloads each section further according to playlist successively in HTTP mode and plays out, and in process, circulation refreshes playlist, to obtain new slice information.

It is in that by the place that the method for key frame section is not enough above:

1. during terminal plays, it is necessary to first download playlist, downloading each section further according to playlist successively and play out, programme televised live from source station periodic refreshing index list file, need to take server resource, reduce response speed.

2. in order to support direct broadcast time-shift, in live broadcast system, it is necessary to preserve the information such as the timestamp of all sections, duration and URL, and need real-time query data base.During time shifting broadcasting, it is necessary to according to playlist, all slice information before calculating terminal, bring bigger IO pressure and complicated logic to streaming media server.

Summary of the invention

It is an object of the invention to overcome the problems referred to above, the duration section protocol such as have employed, carry out waiting duration cut into slices and preserve according to timestamp by video flowing, filename temporally stabs and is named.Calculate the URL of section when player plays and dragging according to time point, download and play.

In the present invention, the section of programme televised live calculates according to absolute timestamp (number of seconds of distance 1970-01-0100:00:00UTC).

First and server time-revise in the present invention, in live broadcast system, player, obtains currently correct absolute time, then calculates URL, downloads section, commences play out.

During time shifting broadcasting, it is possible to directly calculate the URL of the section file of terminal according to time point, play out.

Above-mentioned situation all without from source station periodic refreshing listing file, eliminating the request of index file, be greatly improved response speed, can effectively reduce server load.The comparison of the duration microtomies such as accompanying drawing is and other microtomy.

Wait the Streaming Media dicing method of duration and the system of the present invention include: live video stream carries out waiting the streaming media server of duration section according to absolute timestamp, and special-purpose terminal player accordingly.

The above-mentioned video flowing carrying out cutting into slices is when encoder is encoded, and for ensureing that each section can independently decode, sets key frame distance less than given section duration, so may insure that each section comprises key frame (I frame).Such player is taken and a piece of can be play immediately.

Accompanying drawing explanation

Accompanying drawing be the embodiment of the present invention playing flow figure and with the contrast of other modes.

Detailed description of the invention

Below with reference to accompanying drawing, embodiments of the invention are described in detail.It is to be understood that embodiment described herein is only for illustrating the present invention, is not intended to limit the present invention.

Referring to accompanying drawing, it illustrates the Streaming Media section waiting duration and the terminal plays flow process of the embodiment of the present invention, comprises the following steps:

Step 1. live broadcast stream media server starts video flowing is cut into slices by given section duration, and section file is named by absolute timestamp.Absolute timestamp is the number of seconds of distance zero point on the 1st January in 1970, shows as the integer of a long number.For convenience of understanding, when we illustrate, the name of section was replaced with date and time, such as: first section for 20151222100000.ts, represents that it is December in 2015 10:00:00 on the 22nd section carried out, and second section is 20151222100003.ts, ..., the rest may be inferred；

Step 2. terminal player and server time-revise；

Step 3. terminal player starts to download first section file 20151222100000.ts, is saved in relief area；

Step 4. terminal player calculates the URL of second section file automatically, it is assumed that given section duration is 3s, then second section is 20151222100003.ts, then downloads 20151222100003.ts, is saved in relief area；

Step 5. terminal player calculates the URL of the 3rd section file automatically, and downloads the 3rd section file 20151222100006.ts, is saved in relief area；

Step 6. terminal player commences play out the data of relief area, downloads subsequent slice simultaneously in good time；

The above-mentioned video flowing carrying out cutting into slices is when encoder is encoded, and for ensureing that each section can independently decode, sets key frame distance less than given section duration, so may insure that each section comprises key frame (I frame).Support that the special player without index slicing mode is when playing, it is not necessary to from source station periodic refreshing listing file, eliminate the request of index file, be greatly improved response speed, can effectively reduce server load.

Claims

1. the live TV stream network transfer method waiting duration section and system, it is characterised in that comprise the following steps:

Step 1. live broadcast stream media server starts video flowing is cut into slices by given section duration, and section file is named by absolute timestamp；

Step 2. terminal player and server time-revise；

Step 3 terminal player sends playing request, obtains slice information, starts to download first section file, is saved in relief area；Terminal player calculates the URL of second section file automatically, and downloads second section file, by that analogy, calculates section file URL successively, downloads and play subsequent slice, it is not necessary to source refresh list file is returned in timing；

Step 4. terminal player commences play out the data of relief area, downloads subsequent slice simultaneously in good time.

2. the method for the duration such as Streaming Media according to claim 1 section, it is characterized in that, the video flowing carrying out cutting into slices is when encoder is encoded, for ensureing that each section can independently decode, set key frame distance less than given section duration, so may insure that each section comprises key frame (I frame).

3. the method for the duration such as Streaming Media according to claim 1 section, it is characterised in that in described step 1, video flowing is cut into slices by given section duration, section file is named by absolute timestamp.

4. the method for the duration such as Streaming Media according to claim 1 section, it is characterized in that, described step 3, in 4, terminal player calculates the URL of second section file automatically, and download second section file, by that analogy, calculate section file URL successively, download and play subsequent slice, it is not necessary to source refresh list file is returned in timing.

5. by duration slice systems such as the Streaming Medias of method for designing described in Claims 1-4, including realizing the streaming media server of previous designs method and support the special player without index dicing method.