[vlc-devel] Re: MPEG2-TS closed caption support...

[Brian Raymond]

An update...

I did some more looking and it turns out the data I need to get at is  
in band VBI so I'm going to add to the decoder so it can handle it.  
I'm interested in also handling substreams so I'll be doing that as  
well after I get VBI handled.

- Brian


On Aug 13, 2005, at 11:23 PM, Brian Raymond wrote:

>
> On Aug 13, 2005, at 6:53 PM, Derk-Jan Hartman wrote:
>
>
>> On 13 aug 2005, at 22:57, Brian Raymond wrote:
>>
>>
>>> I'm currently using VLC for handling the audio/video in MPEG-TS  
>>> streams, I also want to get at some CC data encoded in them. I  
>>> noticed ticket #77 (https://trac.videolan.org/vlc/ticket/77) in  
>>> trac, which discusses support. This looks like it's geared  
>>> towards input from video devices however based on what looking  
>>> I've done in VLC's code the demux modules would pull it out and  
>>> some other code would handling processing it.
>>>
>>>
>>
>> Are we talking about EBU teletext DVB substream? or another DVB  
>> substream type? or in-video VBI data?
>> There are many ways to transport this data. the first ones are  
>> easily retrievable. The data just needs to be extracted at the  
>> demux level (modules/demux/ts.c) and forwarded to a decoder. in  
>> video vbi data is really annoying in that you need to retrieve the  
>> CC from the mpeg2 decoder, and none of the mepg2 decoders  
>> currently support this as far as i know.
>>
>>
> Thanks for the information.
>
> I'm trying to track down the specific type right now, from what  
> I've looked at it should be a teletext substream so I'm working off  
> that assumption. I'm going to be dumping the stream to disk so I  
> have some test data but at the moment I don't. I'm diving into the  
> demuxer tonight to see what I come up with.
>
>
>
>
>>
>>
>>> In my case I want to dump the CC to a pipe so that some other app  
>>> can pick it up as an input stream.
>>> I want to tackle adding this support so I wanted to check to see  
>>> if anyone has done any work with CC support? I'd also appreciate  
>>> any pointers anyone could share.
>>>
>>>
>>
>> DJ
>>
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