On Thursday 12 January 2006 13:22, Scott Alfter wrote: > The local cable system has a bunch of audio channels up in the 900s with > music, talk radio, etc. Out of curiosity, I tried recording from them over > FireWire with the same tools that grab HD channels and such. With the > cable box set to one of the audio channels, it spits out a transport stream > containing just an AC3 audio stream--no video. test-mpeg2 captures this > stream with no problems. mplayer should be able to play it; I know it can > demux it and dump the AC3 stream to a file (use the -dumpaudio option, with > -dumpfile to specify an output filename). The AC3 file can then be played > as-is or converted to another format. > > The talk-radio stream I grabbed as a test looks like it's encoded at 128 > kbps. The graphics displayed on the cable box's analog outputs are > generated by the cable box. They're not part of the incoming stream, which > is why the captured stream contains only audio. > > Where MythTV comes into this is that it you would think that since it's > capable of recording from FireWire-equipped cable boxes, it'd be able to > grab these audio-only streams. It would appear that the lack of a video > stream confuses mythbackend, though, as you end up with a zero-byte file. > > I know that radio != TV, but it seems to me that this could be a nice extra > capability that probably wouldn't need much extra work to get it working > right. I suspect there are some sanity checks of the incoming stream that > are getting confused by the lack of video; disabling these checks for > certain channels (and disabling other processing, such as commercial > flagging, that won't work without video) would get the job done. >
there is a patch in SVN for doing similar for DVB radio, it should work for this as well since it creates its own video. I haven't tried it personally yet though... -- Steve _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
