Re: 608 samples

i highly recommend using CPC's demo SCC file for testing any 608 decoding and rendering code. the example file demonstrates pop-on, paint-on, and roll-ups, a variety of screen positioning and split-caption scenarios, and contains pretty much all the allowed characters in the 608 character set.

-glenn


From: Christian Vogler <christian.vogler@gallaudet.edu<mailto:christian.vogler@gallaudet.edu>>
Date: Tuesday, April 1, 2014 8:26 AM
To: Philip Jägenstedt <philipj@opera.com<mailto:philipj@opera.com>>
Cc: "public-texttracks@w3.org<mailto:public-texttracks@w3.org>" <public-texttracks@w3.org<mailto:public-texttracks@w3.org>>, Ken Harrenstien <klh@google.com<mailto:klh@google.com>>
Subject: Re: 608 samples
Resent-From: <public-texttracks@w3.org<mailto:public-texttracks@w3.org>>
Resent-Date: Tuesday, April 1, 2014 8:26 AM

Let me know if you want a fork that adds support for paint-on captions in Xine and also fixes a Unicode encoding bug, along with a test DVD image. I no longer have write access to the Xine repo since they switched away from svn, and this type of captioning is so rare that I decided not to bother with pushing the patch back upstream.

Christian


On Tue, Apr 1, 2014 at 8:19 AM, Philip Jägenstedt <philipj@opera.com<mailto:philipj@opera.com>> wrote:

Brilliant! I've actually already contacted the ccextractor maintainer and he's very helpful. I'll also check out the Xine code, I've used it a lot myself because of the good DVD support.

Philip

On Apr 1, 2014 6:52 PM, "Christian Vogler" <christian.vogler@gallaudet.edu<mailto:christian.vogler@gallaudet.edu>> 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<mailto: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<mailto: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<mailto: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<mailto: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<mailto: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<tel:202-250-2795>



--
Christian Vogler, PhD
Director, Technology Access Program
Department of Communication Studies
SLCC 1116
Gallaudet University
http://tap.gallaudet.edu/
VP: 202-250-2795