[vlc-devel] PSM with AC-3/A52 and Close Caption Subtitles (Was: Re: [vlc-devel] [ANN] VLC 0.8.0-test2)

Leon Woestenberg leonw at mailcan.com
Sat Oct 2 00:54:01 CEST 2004

Hello all,

Gildas Bazin wrote:

>Hello everybody,
>Here is the second test release in preparation for 0.8.0 (aka Janus).
>You will find the new tarball here:
>Binaries for Win32 and MacOSX have also already been uploaded.
We are working on two new features:

I) Now that demux/ps.* parses the MPEG-2 System PS "Program Stream Map", 
we would like
to add A/52 audio track support.

According to the A/52 standard, A/52 (Dolby AC-3) audio streams can 
occur in MPEG-2
(Transport) Streams in two ways:

1) In private_stream1  (stream_id == 0xBD) and (stream_type == 0x06)

2) In private_stream1 (stream_id == 0xBD) and (stream_type == 0x80)

See the addendum (A?) in :  http://www.atsc.org/standards/a_52a.pdf

II) Close Captioning (Subtitles for the hearing impaired) support in A/53C

Somewhere around page 35 in 

We will be generating test streams starting from next week along with 
any patches to make VLC
handle these PS correctly.

We might be asking questions on how we would need to deal with feature II...

Thanks for the fabulous amount of work,


Leon Woestenberg.

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