Been looking into this myself. Basically, you need a soundcard that can record the AC-3 signal from coax, and you need a video capture device that does NOT encode audio into the datastream you get from /dev/video. This is basically anything except the PVR-XXX cards. And of course, you need some way to get the AC-3 datastream to your receiver. Make sure that someone's actually gotten recording under linux to work before you shell out your money. From what I've read, it can be a bit tricky.
I've got an amd64 motherboard that has digital coax in and out (using the nforce4 chipset). As soon as I verify that it can capture an AC-3 datastream under linux, I'm thinking of grabbing some bttv supported card cheap off e-bay, or maybe a Matrox Marvel G200, if it will work on the amd64. -- Tony Lill, [EMAIL PROTECTED] President, A. J. Lill Consultants fax/data (519) 650 3571 539 Grand Valley Dr., Cambridge, Ont. N3H 2S2 (519) 241 2461 --------------- http://www.ajlc.waterloo.on.ca/ ---------------- "Welcome to All Things UNIX, where if it's not UNIX, it's CRAP!" John DiLorenzo <[EMAIL PROTECTED]> writes: > OK, so I'm out of luck recording the audio with the PVR-150. How about the > sound card method... Will I be able to use a single soundcard to capture 5.1 > via coax, and then > output via optical? Will I need 2 soundcards in this box? > > > On 11/12/05, Michael T. Dean <[EMAIL PROTECTED]> wrote: > > PVR-150 records NTSC or PAL. > > NTSC/PAL don't do 5.1 channel audio--they support only 2-channel stereo > sound. > > Therefore, PVR-150 cannot record 5.1 channel audio. > > However, Dolby Surround ( http://en.wikipedia.org/wiki/Dolby_Surround ) > is a technology whereby multiple audio channels ( 4.0 channels) are > encoded within a standard 2-channel (stereo) signal and decoded using a > Dolby Pro Logic ( http://en.wikipedia.org/wiki/Dolby_Pro_Logic ) > decoder. Often, when a show is broadcast (on digital stations) in Dolby > Digital=AC-3=5.1 ( http://en.wikipedia.org/wiki/Dolby_Digital ), the > analog stations transmit Dolby Surround encoded in the stereo signal. > > The PVR-150 records the stereo signal broadcast with the show, so--in > theory--it would be possible for Hauppauge to support Dolby Surround. > However, the PVR-x50's do not contain a Dolby Surround decoder--instead > only a stereo decoder--so only two channels of audio are encoded in the > stream. > > However, most ALSA drivers will automatically replicate the left- and > right-front channels to the left- and right-rear (and surround if you > have a 7.1 channel setup) speakers since it has only a minor effect on > the perceived positionality of the sounds. If your driver doesn't, you > can easily add a translation table to your .asoundrc to do it yourself. > > If you really want 5.1 channel, though, you'll have to go to a digital > video broadcast technology (like HDTV (US) or DVB). > > Mike > _______________________________________________ > mythtv-users mailing list > mythtv-users@mythtv.org > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users > > > > > _______________________________________________ > mythtv-users mailing list > mythtv-users@mythtv.org > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users _______________________________________________ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
