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

[Brian Raymond]

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
>
> -- 
> This is the vlc-devel mailing-list, see http://www.videolan.org/vlc/
> To unsubscribe, please read http://developers.videolan.org/lists.html
>
>
>

-- 
This is the vlc-devel mailing-list, see http://www.videolan.org/vlc/
To unsubscribe, please read http://developers.videolan.org/lists.html