[mythtv-users] DVD audio with M-audio sound card
Mike Jasper
e394td at comcast.net
Sat Mar 13 11:48:11 EST 2004
Joseph A. Caputo wrote:
> On Thursday 11 March 2004 11:09, Mike Jasper wrote:
>
>>Hi,
>>
>>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
> output devices.
>
> 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.
Thank you for a really clear explanation! I have a lot to learn :-)
--Mike
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