[mythtv-users] DVD audio with M-audio sound card
Joseph A. Caputo
jcaputo1 at comcast.net
Thu Mar 11 12:29:01 EST 2004
On Thursday 11 March 2004 11:09, Mike Jasper wrote:
> I'm putting together a new Myth box with an M-audio Audiophile sound
> card. I'm using this card because I also plan to do a bunch of
> recording of analog sources using that box, and this is a good card
> for that.
> However, the card doesn't have a connector where I can attach the
> audio cable from the DVD-ROM drive. If I attach the connector to the
> motherboard header (Asus P4P800 mobo), will Myth be able to grab
> sound from the on-board sound device when playing DVDs and route it
> through the M-audio card? Or is there a better solution?
> I'd hate to give up on the M-audio card but the more I look at it the
> less it seems viable.
The audio cable from a CD/DVD drive is typically only useful for 'dumb'
audio CD player software which simply instructs the CD/DVD drive to
start playing a particular audio CD track, which bypasses the IDE/
ATAPI/SCSI interface and just outputs line-level audio. This
capability is typically only useful for direct playback of audio CDs,
and some CD-based games that play CD audio from the game CD.
DVD drives typically cannot 'play' DVD content in that manner, as the
content is not 'raw', like CD-audio, but encoded MPEG-2 content
encapulated in a special DVD format (VOBs + special filesystem
structure). Both the audio & video portion of the DVD stream must be
decoded (usually in software, but it can be done in hardware if you
have a PVR-350, DXR3 or other hardware MPEG-decoder board and software
that makes use of it). The decoded audio + video streams are handled
by your player software and passed to the appropriate audio & video
So, the short answer is you do not need to connect the audio cable from
your DVD drive to get audio in your DVD playback.
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