Re: 608 samples

Thanks jb, that looks useful as a reference. Would you happen to know
where the extended characters "THAT COME FROM HI BYTE=0x12 AND LOW
BETWEEN 0x20 AND 0x3F" and "THAT COME FROM HI BYTE=0x13 AND LOW
BETWEEN 0x20 AND 0x3F" are actually defined? Also, do you know of a
tool to mux arbitrary 608 data with an existing caption-less file for
testing?

Philip

On Tue, Apr 8, 2014 at 12:27 PM, Jean-Baptiste Kempf <jb@videolan.org> wrote:
> VLC has a 608 decoder, that should support all 608, including roll-up
> captions (a contrario from Xine) and tested with actual NTSC streams.
> http://git.videolan.org/?p=vlc.git;a=blob;f=modules/codec/cc.c;hb=HEAD
>
> On 01 Apr, Christian Vogler wrote :
>> There are also at least two open-source projects that have CEA-608 caption
>> decoders - Xine (for the subset that is used on DVDs in the libspucc/
>> source folder) and CCExtractor. Xine doesn't support roll-up captions,
>> since they never appear on DVDs, but it handles pretty much everything
>> else, including a file that Giovanni Galvez threw at me for testing a
>> couple years ago.
>>
>> Christian
>>
>>
>>
>>
>>
>>
>> On Mon, Mar 31, 2014 at 2:39 PM, Philip Jägenstedt <philipj@opera.com>wrote:
>>
>> > Thank you Ken!
>> >
>> > I remember now that SCC was one of the standalone 608 formats you
>> > mentioned at FOMS. The raw essence is exactly what I'm interested in,
>> > so that sounds very promising.
>> >
>> > I've asked to order a copy of "The Closed Captioning Handbook" for my
>> > office, it looks very relevant to what I do.
>> >
>> > Philip
>> >
>> > On Tue, Apr 1, 2014 at 1:10 AM, Ken Harrenstien <klh@google.com> wrote:
>> > > Giovanni Galvez is still there and still super helpful.
>> > > Their software is widely used in the industry for format
>> > > conversion.
>> > >
>> > > We host one of their demo videos at
>> > > http://www.youtube.com/watch?v=BbqPe-IceP4
>> > >
>> > > and I'm sure Giovanni can send you the corresponding SCC
>> > > files for that or any other demo video they have.  The reason
>> > > I suggest SCC is that this format contains the raw 608 essence
>> > > that we care about; in fact, this is YouTube's preferred upload
>> > > format for movie/TV content.  If you want to know how to extract those
>> > > bytes from a video file, then you have a much harder task given
>> > > the multitude of video containers and formats.
>> > >
>> > > And yes, the CFR link, while terse, does contain pretty much all
>> > > of the important bits.  The CEA documents are mostly about
>> > > XDS data, which has nothing to do with captions.  For
>> > > purposes of WebVTT conversion a much better place to start
>> > > learning about 608 is the "Closed Captioning Handbook" by Gary Robson,
>> > > which should still be available on Amazon.  I like it because it's
>> > > very readable and has so much other interesting context.
>> > >
>> > > On the other hand, if you plan to implement some kind of
>> > > cable set-top box, then yes, you'll need the CEA documents
>> > > plus several other specs.
>> > >
>> > > --Ken
>> > >
>> > >
>> > > On Mon, Mar 31, 2014 at 8:58 AM, Philip Jägenstedt <philipj@opera.com>
>> > > wrote:
>> > >>
>> > >> Do you mean http://www.cpcweb.com/webcasts/webcast_samples.htm ?
>> > >>
>> > >> What I'm looking for is the actual video file that contains the 608
>> > >> data, preferably with some clue about how to extract it as well :)
>> > >>
>> > >> Philip
>> > >>
>> > >> On Mon, Mar 31, 2014 at 10:16 PM, Christian Vogler
>> > >> <christian.vogler@gallaudet.edu> wrote:
>> > >> > Gio Galvez at CPC did a video like that. His company was bought out,
>> > but
>> > >> > it
>> > >> > might still be possible to get access. Should I ask?
>> > >> >
>> > >> > Sent from my mobile phone.  Please excuse any touchscreen-induced
>> > >> > weirdness.
>> > >> >
>> > >> > On Mar 31, 2014 9:53 AM, "Philip Jägenstedt" <philipj@opera.com>
>> > wrote:
>> > >> >>
>> > >> >> Hi all,
>> > >> >>
>> > >> >> Does anyone have access to 608 caption data and recommendations for
>> > >> >> software that is known to render it correctly? I'd like to understand
>> > >> >> the 608 model at the lowest level, but it's hard without examples.
>> > I'm
>> > >> >> guessing that people who have worked on 608 to WebVTT already have
>> > >> >> sample files and scripts to process them, so anything like that would
>> > >> >> be appreciated.
>> > >> >>
>> > >> >> Also, the spec is incredibly brief, is there really nothing better
>> > than
>> > >> >> this?
>> > >> >> http://edocket.access.gpo.gov/cfr_2007/octqtr/pdf/47cfr15.119.pdf
>> > >> >>
>> > >> >> Philip
>> > >> >>
>> > >> >
>> > >>
>> > >
>> >
>>
>>
>>
>> --
>> Christian Vogler, PhD
>> Director, Technology Access Program
>> Department of Communication Studies
>> SLCC 1116
>> Gallaudet University
>> http://tap.gallaudet.edu/
>> VP: 202-250-2795
>
> --
> With my kindest regards,
>
> --
> Jean-Baptiste Kempf
> http://www.jbkempf.com/ - +33 672 704 734
> Sent from my Electronic Device

Received on Tuesday, 8 April 2014 11:57:43 UTC