On Friday 07 January 2005 19:26, Bobby Cox wrote: > Hi all, > > My roommate and I are hearing impaired (deaf) and have been working on > figuring out how CC and VBI support is implemented in the ivtv driver as > well as MythTV. Our goal is to have 100% functioning closed captioning > on a television with tv-out via a nvidia card (Geforce FX 5200). We are > using a PVR-250 to test. > > So far it seems that there are two "modes" -- passing through the CC > directly to a tv-out device (seems to only support the PVR-350) and > embedding in the mpeg stream. When we try turning on mpeg cc embedding > with ivtv 0.3 it simply makes /dev/video0 show black and a test capture > produces abnormally small mpeg files. > > In any case, I'm e-mailing to find out what's happening with the ivtv > driver and vbi support, and if anybody's gotten it working with MythTV > or any other piece of software.
I'm responsible for the current VBI implementation, so I should know :-) It's probably best to use the latest 0.2 driver instead of the (more beta) 0.3. The current state is that you can embed CC data in the stream by running ivtvctl -x 1 -b cc. Note that this only works for stream_type 0 (program stream), not for other stream types. In doc/README.vbi you will find the format of the embedded VBI data. To the best of my knowledge nobody has written the necessary code to use the embedded CC data from within MythTV. An additional problem is that the CC is almost certainly out-of-sync with the video. This is probably a non-trival driver issue and hard for me to fix since I live in PAL land. Regards, Hans ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ ivtv-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ivtv-devel
