Application requirements
For online new media, governments, public institutions and enterprises to build a live video or network TV station system, the multi-channel audio and video signals are encoded in real time and sent to a streaming media server (Windows Media Services or P2P), and the streaming media server provides live streaming services. The client can watch colorful live and on-demand programs conveniently and quickly through the Internet.
Everyone knows that P2P is a transmission method of a streaming media system, which is mainly used for the transmission of video information on the public network to provide online viewing services for thousands of clients with a small amount of public network bandwidth. At present, the P2P streaming media publishing platform is becoming more and more mature, but the front-end encoding method is still more serious. For example, the single-machine encoding efficiency is low, the encoding machine is too many, and the amount of maintenance is large. The following we use a network TV platform to establish a P2P video service platform Application requirements:
1. Provide standard WMV encoding for existing P2P platforms, and provide data sources for P2P servers with MMS, RTST, and HTTP data streams.
2. Transmit the domestic satellite TV channels to the Windows Media Services (hereinafter referred to as WMS) through the use of a stand-alone multi-coding workstation to collect and encode the multi-channel analog TV signals. The WMS provides the MMS network data stream to the P2P service platform.
3. Since the live broadcast service is provided on the public network, it is necessary to ensure the image quality and control the network traffic. The video image format: 640 * 480 and the code stream size: 300kpbs ~ 512kpbs.
4. Encoding can also add video information subtitles, station logo customization and other functions.
5. The system supports multi-task recording, and the recorded files can be directly edited by a third-party non-editing system.
6. The system runs continuously for 7 * 24 hours
solution
According to user needs, we use the AV signal obtained by the cable demodulator and the digital TV through the signal demodulator, using the AVCaster Century Sunflower multi-channel encoding workstation to collect and encode in real time. WMS server, WMS provides WMV encoded MMS, RTST, HTTP data stream to provide data source for P2P server; upload live broadcast source and record the program as WMV standard streaming media format for later editing.
The system topology is as follows:
System composition
The system consists of TV2AV (cable TV signal demodulator), AVCaster (multi-channel acquisition workstation), and Windows Media Services streaming media server.
1. TV2AV ... 1 RF input, demodulate 4 ~ 16 different TV channel signals (AV), in order to be used as the signal source of the collection workstation;
2.AVCaster ...... A single server collects 4 ~ 16 groups of AV signals, compresses it into MPEG4 data stream in real time, and publishes it to the WMS server to meet the needs of live broadcast;
3. WMS server ... Provide the publishing of streaming media data, and provide the data source for the P2P server;
System functions
1. Support 7 * 24 hours of uninterrupted operation to meet carrier-grade applications;
2. At the same time, encoding can add video information subtitles, station logo customization and other functions;
3. AVCaster supports multiple recording modes, and can also manually, automatically, or according to the program table to record the live data stream uploaded by AVCaster, and can directly record into WMV format media files, and automatically generate WMS on-demand publishing points for The user performs VOD on demand;
4. Video programs support network storage, which can store the recorded programs to network neighbors or NAS storage;
5. Provide independent program production and editing tools, which can quickly convert media files in VCD, DVD and other formats into WMV format highly compressed programs, and can transfer media files in RM / RMVB format at a speed similar to file copying. Into WMV format files, so that WMS can recognize and provide VOD on demand, and can cut and merge WMV or ASF programs at a copy level;
AVCaster performance index
1. Built-in WEB publishing service, supporting access to more than 500 unicast users, using multicast mode, and the number of live broadcast users is unlimited, the system supports two modes of B / S and C / S, and supports remote management;
2. Integrate many functions such as audio and video collection, compression, storage, publishing, user authentication, remote management and Web services;
3. Support 7 * 24 hours uninterrupted collection and encoding live broadcast service, automatically upload to WMS service.
4. The audio and video are fully synchronized, and the live broadcast delay can be controlled within 1 ~ 3 seconds (using a dedicated player);
5. Video compression format is MPEG4-2, WMV7, WMV9, audio compression format is MP3, WMA, using hardware and software combination to complete compression, can support up to 16 channels D1 (720 * 576) 8 channels CIF (352 * 288 ) A / V signal collection, compression, storage, live broadcasting, on-demand and other recorded files, video stream 8kpbs-6000kpbs adjustable, audio output stream 8kpbs-160kpbs adjustable; 6, support PAL-D, NTSC ;
7. Support the function of setting video attributes, such as setting the image format size, brightness, contrast, etc. of the video capture device;
8. Support functions such as time-lapse recording and task-based recording. The recorded programs can be directly provided for on-demand;
9. Support recording programs directly to network disk and NAS storage;
10. The recorded video file fully supports later non-linear editing software Adobe Premiere, Movie Maker, etc .;
Partial interface preview
A. Acquisition encoder interface
B. Interface for setting live data stream recording
C. User case: Sohu Internet TV: http://tv.sohu.com
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