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Closed Captions pass-through for hearing impaired #55

Closed razzeee closed 7 years ago

razzeee commented 7 years ago

Reported by Gamester17 on 4 Oct 2003 11:04 UTC

Closed Captions pass-through for hearing impaired

This Request is for pass-through CC (line 21 dat) only!

Closed Captions (pass-through) for the hearing impaired:

Closed captioning (CC, or line 21 data) is a simple feature that is included in most US(NTSC) DVD-movies (VOB files), and if the DVD player pass- through that signal to a TV that supports CC the TV will decode and display them on demand. The MS dash (XBOXDASH.XBE) DVD player supports CC so therefor the Xbox hardware has support for it. For the hearing impaired, they are a must to fully enjoy DVD movies as they display text of audio that going on that only the hearing can hear and the normal subtitles do not show. PS! I believe CC is only broadly used in the U.S.A.

Xbox video encoder chip (Coexant CX25870/871) supports Closed Captions pass-through and source code for it's control features are available: http://secure.netroedge.com/~lm78/docs.html

Xbox i2c/SMbus programming example http://warmcat.com/milksop/x.html

Coexant CX25870/25871 debugging tools: http://rex.xbox-scene.com/I2C/i2c-prog.html

Be TV Out project also has code for this chip: http://sourceforge.net/projects/betvout/

More info on Closed Captions (CC, line 21 data): http://www.robson.org/capfaq/technical.html

XBMP forum discussion thread for this feature/function: www.xboxmediaplayer.de/cgi-bin/ib31/ikonboard.cgi? act=ST;f=8;t=5135

FYI: Closed Caption FAQ

Are there captions on DVDs?

Standards were created very late for DVDs, so there are several different ways to put captions on them. The most common approaches are to either embed Line-21- style captions in what are called the "user bits," or to use "subpictures" to display captions that look like subtitles. Your DVD player must support the same method that was used to encode the DVD, although many DVDs use both of these methods.

When using subtitles, DVDs support captioning in multiple languages.

What's the difference between subtitles and captions?

Generally speaking, subtitles are intended for hearing audiences and captions for deaf audiences. Subtitles may translate the dialog into a different language, but rarely show all of the audio. For example, captions show sound effects (e.g., "phone ringing" and "footsteps"), while subtitles don't.

Why does my DVD show subtitles and captions simultaneously?

In an effort to work with as much equipment as possible, some DVDs are encoded with both subtitles and closed captions. If your TV is set to show captions, and you turn on the DVD subtitles, you'll see the captions over top of the subtitles. If you're getting both, you'll have to either turn off subtitling on the DVD player, or turn off captions on the television set.

Can you use captions for anything else?

Closed Captions pass-through signals are also used by third-party external CC readers such as TV Guardian and Cursefree TV to censor/filter audio/speach DVD's in TV (can auto mute the audio on programed CC signals), this does not work on normal subtitles.

Migrated-From: http://trac.kodi.tv/ticket/55

razzeee commented 7 years ago

Comment by gamester17 on 26 Sep 2005 17:03 UTC

Logged In: YES user_id=630186

assigning to Carlos (a.k.a. CFS)

razzeee commented 7 years ago

Comment by gamester17 on 10 Oct 2005 06:51 UTC

Logged In: YES user_id=630186

@cfsmp3, any updates on this?, ...hope to see it in CVS soon :)

razzeee commented 7 years ago

Comment by gamester17 on 18 Jul 2007 11:49 UTC

Logged In: YES user_id=630186 Originator: YES

@cfsmp3, heard you were looking into Closed Captions again(?), have you made any progress? and is it for the the DVDPlayer core or for the MPlayer core? ...and is it for pass-through or software decoding/displaying?

razzeee commented 7 years ago

Comment by cfsmp3 on 18 Jul 2007 16:20 UTC

Logged In: YES user_id=642118 Originator: NO

Current status:

No progress whatsoever integrating ccextractor in XBMC. This is my summer project which I'm starting now. What I'd like to do have XBMC display closed captions directly. I believe it's more interesting to do it in mplayer than the dvdplayer - DVDs have subtitles anyway, except from some region 1 (mostly 80's TV shows). However, I'm going to be working on linux (not the original xbox any more) - I understand that XBMC's mplayer isn't running yet, is it?

The two basic things I need (either to write myself if they don't exist, or hook up to them):

I think that's it. If Mplayer works on linux I'd start with it, if only dvdp works I'll get into it, even if it's less interesting.

razzeee commented 7 years ago

Comment by gamester17 on 18 Jul 2007 18:36 UTC

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The developers working on the Linux port of XBMC have decided to hold of on porting MPlayer to Linux (yes it would have to be a port since it must run as a DLL/SO library in order to be used properly in XBMC).

Instead the developers are firtly going to priorityze working on extending the features and functions in XBMC's DVDPlayer so that it get up to par with MPlayer, (stuff like external subtitles, and streaming, etc.).

So it would probably be better if you aim your patch at the DVDPlayer instead of MPlayer, or alternativly do a patch for both.

razzeee commented 7 years ago

Comment by gamester17 on 4 Aug 2007 14:25 UTC

Logged In: YES user_id=630186 Originator: YES

@cfsmp3, any progress? ...note that this the RFE for hardware pass-through, the software decoder RFE can be found here: http://sourceforge.net/tracker/index.php?func=detail&aid=817654&group_id=87054&atid=581841

razzeee commented 7 years ago

Modified by sho on 8 Aug 2008 17:04 UTC

razzeee commented 7 years ago

Comment by Martijn on 17 Sep 2012 15:01 UTC Closing as these are for an outdated version

razzeee commented 7 years ago

Modified by Martijn on 18 Sep 2012 12:46 UTC