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Asked: 2026-05-29T06:23:01+00:00

I am writing a demultiplexer for MPEG Transport Stream which should extract Audio and

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I am writing a demultiplexer for MPEG Transport Stream which should extract Audio and Video
access points.
Assume i have an Audio PID and that i know it is AC-3 audio.
Also assume that i collected all the PID’s TS packets and assembles their PESes.

1.How can i extract the AC-3 access points?
by what i read so far the AC-3 header should start with 0x0B 0xFF, however by looking at
the PES’s payload it is not there…
2.The AC-3’s PES streamID is PRIVATE_STREAM_1. does it has the “Optional PES header”?

Thanks!

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1 Answer

  1. Editorial Team

    PES header is defined under MPEG2 systems – which was created before AAC.

    PES packetization is general purpose and hence there is no notion of private/special headers depending on any codec.

    All payload of PES (i.e. data other than PES header) -concatenated forms the ES stream for any codec.

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