-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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. _/_ / v \ Scott Alfter (IIGS( http://alfter.us/ Top-posting! \_^_/ rm -rf /bin/laden >What's the most annoying thing on Usenet? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFDxp5LVgTKos01OwkRAg1PAKCr3H8jYx1QzI9RN8tw7tjoG1g4lwCgn85c 0rpDZ3r91Fezwa0GYwh36wg= =1427 -----END PGP SIGNATURE----- _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
