> Got the patch applied now thanks, first impressions of actual decoding > is very good. Current issues I have, sorry don't have time to > investigate much, but thought you might like the feedback: > > Using Hauppauge PVR-350 for recording, playback using EPIA TV-out > (Unichrome & Software). > > So the only relevant one may be: > > 1) 888 subtitles are not 100%, this could be reception issues - > difficult to tell, however my picture is crystal clear and other txt > pages I tried did not present any typical bad reception type errors. > > Other comments (This is my first experience of TText on Myth so these > comments may be more general?) > > 2) Text fonts/colours (obviously only grey scale when using > Unichrome), I presume just a matter of tweeking the theme? But when > using software decoding impossible to read without contrasting > background. > > 3) OSD offsets do not work for me, so text is often off the right of the > screen. > > 4) Using XvMC_VLD Unichrome decoding, has the usual performance issues > with heavy use of OSD - but then this has nothing to do with your > patch. > > Anyway must dash, > > Paul > > > > > On Tue, 1 Mar 2005 22:47:58 +0100, Martin Barnasconi > <[EMAIL PROTECTED]> wrote: >> Here the first experimental patch for the vbi decoding for PVR cards >> using the >> IVTV drivers. Although its far from perfect (that's why it's classified >> as >> experimental;-) it gives you some idea how things are implemented and I >> challenge you to contribute to fill in the missing gaps or to improve >> the >> code. >> >> What it does: >> it relies on having embedded vbi in the MPEG stream as defined in the >> IVTV >> doc's. The embedded vbi stream includes the magic cookies "itv0' and >> 'ITV0' >> to mark the beginning of a vbi private stream. That's why some >> additional >> lines are added to the avformatdecoder and ffmpeg decoder classes, to >> recognize a vbi data steam. If detected, it will start decoding in the >> vbidecoder class. An additional OSD overlay osdtypeteletext is used for >> teletext and subtitles. Whole process is controlled from tv_play >> routines. >> Pages are updated after receiving new content, so even subtitling pages >> (e.g. >> 888) do work! >> >> What it does not do yet (TODO ;-) >> - It overrules the 'T' key for teletext/CC for non-encoder cards >> (bttv/saa7134) . The original vbi code (part of >> nuppelvideoplayer/recorder) >> is still in, but I rather see this becoming part of this new vbidecoder >> class. Like to see 'C' for CC/subtitles and 'T' for teletext. Problem: >> 'C' >> function already in use... >> As some people have a mixed PVR/bttv setup, we should detect which card >> is >> operational and select the correct vbi decoder. >> - CC is not working yet, as we do not have this here in Europe. Please >> test >> the results in ccbuffer and in your stderr terminal and please report >> your >> findings. >> - Teletext is text-only. No mosaic or other fancy stuff like blanking, >> FLOF, >> blicking, reveal functions yet. Uses current CC_font in OSD. Should be >> teletext font in future. for the OSD overlay, we suffer from the color >> mapping of YUV420 here. Use a font with sufficient width (eg bold fonts) >> to >> be able to read the blue or red text. >> - other embedded data like WSS/PIL/CNI/VPS/PDC captured but not used. >> Framework in place, detection and corresponding actions (e.g. signals >> and >> slots) to be defined. >> - TT OSD overlay is now transparent. Future work is to have black, >> transparent, or even left-TV/right-TT (for 16:9 screens) or TT-PIP >> implemented (for big screens) >> >> Give it a try and report your findings. Improvements are very welcome. >> >> Martin >> >> >> _______________________________________________ >> mythtv-dev mailing list >> [email protected] >> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev >> >> >> >> > _______________________________________________ > mythtv-dev mailing list > [email protected] > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev >
Hi Can this be implimented for dvb to? I't would be great if someone make this work, many channels of my provider sends teletext subs. Cheers! /Staffan _______________________________________________ mythtv-dev mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev
