MpegTS流和PS流区别

MpegTS流和PS流区别 IP数据有首部和数据两部分成的,首部的前一部分是固定度报报报报报报报报报报报报报报报报报报报报报报报报报报20字,是所有报报报报报IP数 据必具有的。首部包括:度、、报报报报报报报报报报报报报报报报报报报MF、DF、片偏移。 在MPEG-2系中,信息合报报报报报报报/分离的程称系接报报报报报报报报/分接,由,音的报报报报报报ES流和 报报报报报报报报报报报报报报报报报报报报助数据接生成的用于的准信息流称MPEG-2报送流，TS: TransportStream,。 据媒体的量不同,报报报报报报报报报报MPEG-2中定了两合信息流:送流，报报报报报报报报报报报报报报TS,和目报报 流，PS:ProgramStream, TS流与PS流的区在于报报报TS流的包构是固定度的,而报报报报报报报报报报PS流的包构是可报报报报报报 度的。 PS包与TS包在构上的差异,致了它具有不同的报报报报报报报报报报报报报报报报报报报报报报报报 抵抗能力,因而用的境也有所不同。报报报报报报报报报报报TS报报报报报报报报流由于采用了固定度的包构, 当破坏了某一报报报报报报报报报TS包的同信息,接收机可在固定的位置它后面包步报报报报报报报报报报报报报报报报报报 中的同信息,从而恢同,避免了信息失。而步步报报报报报报报报报报报PS包由于度是化的,一旦某一报报报报报报报报报报报PS 包的同信息失,接收机无法确定下一包的同步步步报 报报报报报位置,就会造成失,致重的 信息失。因此,在信道境劣,高,一般采用报报报报报报报报报报报报报报报报报报报报报报报报报报报报TS报报流,而在信道 境好,低,一般采用报报报报报报报报报报报报报报报PS报流。 由于TS报报报报报报报报报报报报报报报报报报报报报报报报报流具有的抵抗的能力,因此目前在媒体中行的强MPEG-2 报流基本上都采用了TS报流的包格 MPEG-2 PS是为在存为介为保存为为信息而为为的。而MPEG-2 TS是为在为为为为为信息而为为的网。 目前～MPEG-2 TS最泛地为用是广DVB系为。因为IPTV的原因～也作为一为相普通的为为封当 装格式。 下面是为上的一为准的解析,网个 It is very important to point out that "Program Stream" has a very specific meaning. MPEG-2 has two different multiplexing schemes: Program Stream and Transport Stream. The Program Streams are mostly used in storage applications. Broadcast usage commonly uses the Transport Stream format. If you have one content channel (one program), it does NOT imply that the stream that carries the program would be a Program Stream. In broadcast usage it would be a so-called Single Program Transport Stream (as defined by ISO 13818-1): a multiplexed collection of concatenated Program Streams without beginning or end. VBrick currently only supports Transport Stream which is superior to Program Stream for streaming applications. •An MPEG-2 Program Stream contains one, and only one, content channel. A Program Stream is like a single-passenger car without shock absorbers: drive it on a smooth road. •An MPEG-2 Transport Stream can contain one or more content channels. A Transport Stream is like a high end car or bus: it can carry one or more passengers and has a good suspension system that can handle the bumps in the road. VBrick supports Single Program Transport Stream, so this is like a single passenger car with good suspension. MPEG-2 Multiplexing The MPEG-2 standard allows two forms of multiplexing: •MPEG Program Stream A group of tightly coupled PES packets referenced to the same time base. Such streams are suited for transmission in a relatively error-free environment and enable easy software processing of the received data. This form of multiplexing is used for video playback and for some network applications. •MPEG Transport Stream Each PES packet is broken into fixed-sized transport packets forming a general purpose way of combining one or more streams, possibly with independent time bases. This is suited for transmission in which there may be potential packet loss or corruption by noise, or / and where there is a need to send more than one program at a time.