Why 188 bytes

A program is basically a set of related elementary streams that belong together, e. A single transport stream can carry multiple programs with each being, for example, a different TV channel. From a low-level perspective a transport stream is just a sequence of byte long TS packets. As previously mentioned, there can be many programs with each having multiple elementary streams, but a client usually is only able to present one program at a time.

Therefore it must somehow know which packets to consume and which to discard upon receiving the transport stream. For this purpose there are two kinds of special packets:. Now the client would just filter for these PIDs, each representing a separate ES of the chosen program, and consume them, i. The previous explanations were very broadcast-oriented, in OTT, however, there are special considerations to be made. OTT clients have network connections that are unstable and do not have a guaranteed bandwidth which requires that only content that will be presented should be loaded.

Given that a client is only able to present a single program at a time, having multiple programs in the same transport stream and loading them would be a waste of bandwidth that could be better used otherwise, e. The rest of the packet consists of payload. Packets are most often bytes in length, but some transport streams consist of byte packets which end in 16 bytes of Reed-Solomon error correction data.

The byte packet size was originally chosen for compatibility with ATM systems [1]. Each table or elementary stream in a transport stream is identified by a bit PID. A demultiplexer extracts elementary streams from the transport stream in part by looking for packets identified by the same PID.

In most applications, Time-division multiplexing will be used to decide how often a particular PID appears in the transport stream. Transport stream has a concept of programs, which are groups of one or more PIDs that are related to each other. For instance, a transport stream used in digital television might contain three programs, to represent three television channels. Suppose each channel consists of one video stream, one or two audio streams, and any necessary metadata.

Improve this question. S Baba. S 1 1 silver badge 12 12 bronze badges. I'm not sure what your error may be, but have you checked if you have a sync error , usually the sync bit will be missing when there is some error — Mobrine Hayde. I am not familiar with sync error.

Are you able to provide a short explanation? Also, would you happen to know what the G is at the beginning? If its not Hex, what could it be? Add a comment. Active Oldest Votes. Improve this answer. Thank you Sir! As always you've been instrumental bro my learning. I'm ever grateful : — Baba.

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