[vlc-devel] Re: Tivo file formats (was: Packetizer use within demux module)

Derk-Jan Hartman hartman at videolan.org
Sun Mar 6 11:36:00 CET 2005

On 06 mrt 2005, at 01:14, Neal Symms wrote:
> Derk-Jan Hartman wrote:
>>> I currently discard the closed-caption information because I don't
>>> think VLC
>>> can yet handle streaming subtitle data.
>> What kind of CC info is this? Do you have any idea? is it DVB text
>> subs, DVB picture subs, DVD vobsubs, Teletext subs?
> I'm not sure what is the proper name for this type of CC data.  It's a
> separate Tivo record in the data stream, and consists of 2 bytes of 
> data
> every few frames.  Those 2 bytes sometimes contain text, and sometimes 
> what
> I presume are "control" characters for new-line, clear osd, etc.  The 
> data
> doesn't have any header other than Tivo's proprietary header info.
> My guess is that the demux should re-encode this data as MPEG "user 
> data"
> packets (type 0xb2).  I'm unclear on the details as it relates to VLC,
> however.

Sounds like a typical VBI teletext CC stream. Currently VLC does not 
yet support this, but it should be quite easy.


Universiteit Twente
Derk-Jan Hartman (d.hartman at student.utwente dot nl)

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