On Wed, 2008-02-06 at 02:22 -0800, Andreas wrote: > Am Dienstag, 05. Februar 2008 20:54:26 schrieb Beny Spensieri Jr: > > >From what I understand, the person currently responsible for the ivtv > > > driver, Hans Verkuil, lives in Europe. This slows the development of > > > the Closed Caption code since Europe uses a different system for > > > subtitling broadcasts, as he cannot immediately test his code. > > > > CC has been broken in ivtv since after 0.10.1, I'm not sure what happened > > but that's the last time anyone remembered it ever working. > I am using 0.10.6, and closed captions work perfectly.
They work for PVR-150 and PVR-500 but not for PVR-250 or PVR-350. > > As I also understand, Hans has been working on the code, which is > > graciously tested by a couple of North American users, but it is still > > slow. > > > > Although there is a standard for embedding CC's into an MPEG stream, ivtv > > uses its own for some reason (as per the Tech Help at VideoReDo.com). > > I *think* that mpeg-ts has some specs for embedding (a) subtitles stream(s). > ivtv recordings are mpeg-ps, though. There is a spec for embedding teletext in mpeg-ts, but closed captions are embedded in the video stream for both mpeg-ts and mpeg-ps, but the reason Hans didn't use the standard method was because he couldn't get the firmware to give him enough space to embed the captions that way. Only a portion of the VBI can be embedded in the space available, so the API allows you to chose to embed either NTSC CC or PAL TXT, which is reasonable (NTSC TXT and PAL CC are almost never used in practice.) -- Daniel _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
