Re: Can't get 5.1 Dolby Digital out of S/PDIF
From: R. J. Salvi (rjsalvi_at_nospamambianceacoustics.com)
Date: 04/10/04
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Date: Sat, 10 Apr 2004 21:38:44 GMT
...and maybe this too:
-- Robert J. Salvi, Ambiance Acoustics http://www.ambianceacoustics.com San Diego, CA USA (858) 485-7514 "R. J. Salvi" <rjsalvi@nospamambianceacoustics.com> wrote in message news:lKZdc.9126$Nr3.2120@twister.socal.rr.com... > Hi Derek, > > Maybe this will help: > > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/directX/htm/captureandpreviewpinrequirements.asp > > hth. > "Derek R. Flickinger" <DrFlick@online.InteractiveHomesInc.com> wrote in > message news:uMp6unyHEHA.348@tk2msftngp13.phx.gbl... > > I am sorry, I probably should have been a little more specific (and I am > > sure Robert will be kind enough to keep me honest here). MCE requires > that > > the non-BDA DirectShow Filters with Stream Class Video Capture Drivers > from > > the DirectX 9 interfaces for the TV Tuner and TV Audio filters have to be > > seen as a single entity when feeding the Crossbar Filter, which then feeds > > the rest of the mux and compression components (as seen in GraphEdit) into > > the Stream Buffer Engine. I know of no way to change the pin > configurations > > to support the routing of an "external" audio source into this chain. > > > > =D- > > > > "Derek R. Flickinger" <DrFlick@online.InteractiveHomesInc.com> wrote in > > message news:%23d8ddkWHEHA.3476@TK2MSFTNGP11.phx.gbl... > > > That does not work. The audio <i>must</i> go through the Stream Buffer > > > Engine along with the video to keep them in synch (or at least as close > as > > > it gets). Even running it into the optical in on something like the > > > Audigy 2 and through the PC does not work right because that audio does > > > not follow the trick play functionality either (because it is not going > > > through the Stream Buffer Engine). Even with all of that, we usually > > > still have to put about an 80 mS delay on the audio via the receiver > > > itself to have it synch up correctly (one of the features of something > > > like the AVR series in the Harman Kardon line or using one of the better > > > audio/video switchers). We have found that forcing the external > receiver > > > into one of its Dolby modes works the best all around for this > > > configuration and seems to get the best all-around surround sound > > > experience across all sources. > > > > > > =D- > > > > > > "R. J. Salvi" <rjsalvi@nospamambianceacoustics.com> wrote in message > > > news:MQ3dc.43971$Lq4.8759@twister.socal.rr.com... > > >> Derek, > > >> > > >> Assuming your A/V receiver has more than one optical input, why not > just > > >> run > > >> the STB digital out to one of the receiver's digital inputs? The video > > >> will > > >> still be accessed through the PC and the STB controlled with the MCE > > >> remote. > > >> It may require switching inputs on the receiver whenever you're > watching > > >> TV, > > >> but you'll be certain to have 5.1 when braodcast as such. > > >> > > >> I know, I know...the challenge of having it work the way it's supposed > to > > >> is > > >> too overwhelming to not address. :-) > > >> > > >> You know...one more thing crosses my mind. What sound card/on-board > chip > > >> do > > >> you have? Does it have its own control panel? You might check and see > if > > >> its > > >> control panel has a menu for digital I/O and set it to lock on the > input > > >> signal. hth. > > >> > > >> -- > > >> Robert J. Salvi, Ambiance Acoustics > > >> http://www.ambianceacoustics.com > > >> San Diego, CA USA > > >> (858) 485-7514 > > >> > > >> "Derek R. Flickinger" <DrFlick@online.InteractiveHomesInc.com> wrote in > > >> message news:eoJqTOMHEHA.3776@tk2msftngp13.phx.gbl... > > >>> Robert, > > >>> > > >>> Good point. Since we rarely actually use the internal tuners and > > >> front-end > > >>> the machines with a set top box into the S-Video in, I neglected to > > >>> define > > >>> the environment (I forgot that most installations discussed here are > > >>> using > > >>> the PC-based tuners). We actually run the audio from the set top into > > >>> the > > >>> audio in on the tuner card (you can't put it into the audio card in > the > > >>> machine directly or the trick play features have no control over the > > >>> audio > > >>> signal). Since the set top does "transmit" the audio with Dolby > > >>> capabilities, MCE <i>appears to</i> pass this thru in this > > >>> configuration. > > >>> The problem seems to exhibit itself, as you say, when the external > > >>> amp/receiver tries to "latch onto" the audio signals from certain > > >>> channels > > >>> and it seems to get really confused on how to encode it with it's own > > >>> DSP-based surround audio. > > >>> > > >>> The way I read it, his DVD played did work correctly, so it seems like > > >>> it > > >> is > > >>> more a problem with MCE and the internal tuner than it is with the DVD > > >>> player itself. Either way, sorry for the confusion - I need to be a > > >> little > > >>> more cognizant of the specific configuration and define that before > > >>> replying. As a side note, we would love to be able to use the optical > > >> audio > > >>> out from the STB into the "tuner" instead of the analog signal. > > >>> Hopefully > > >>> this will be taken into consideration as MCE moves to supporting a > more > > >>> versatile set of inputs from a wider variety of digital sources. > > >>> > > >>> =D- > > >>> > > >>> "R. J. Salvi" <rjsalvi@nospamambianceacoustics.com> wrote in message > > >>> news:whTcc.43813$Lq4.39294@twister.socal.rr.com... > > >>> > Hi Derek, > > >>> > > > >>> > Correct me if I'm wrong, but when listening to TV, I believe all > > >>> > analog > > >> TV > > >>> > tuners are only capable of 2-channel stereo. It would explain why > > >>> > "they > > >>> > seem > > >>> > to play in some weird left/right/front/back unbalanced audio > > >>> > mode"...the > > >>> > receiver is trying to decode a stereo only input for a surround > mode. > > >>> > > > >>> > In response to the original posters query...I don't know, but it > > >>> > sounds > > >>> > like > > >>> > a software problem. He might consider uninstalling and subsequently > > >>> > reinstalling his DVD program. > > >>> > > > >>> > -- > > >>> > Robert J. Salvi, Ambiance Acoustics > > >>> > http://www.ambianceacoustics.com > > >>> > San Diego, CA USA > > >>> > (858) 485-7514 > > >>> > > > >>> > "Derek R. Flickinger" <DrFlick@online.InteractiveHomesInc.com> wrote > > >>> > in > > >>> > message news:u3XSL5$GEHA.2664@TK2MSFTNGP11.phx.gbl... > > >>> >> We are curious just how you define "can't get." Are you saying > that > > >> your > > >>> >> indicators on your preamp/amp/receiver are not showing it via its > > >>> >> audio > > >>> > auto > > >>> >> detection features or that you simply cannot hear it (it only comes > > >>> >> out > > >>> >> of > > >>> >> the front speakers)? We have noticed on a few installations that > > >> certain > > >>> >> receivers do not seem to detect it properly, but you definitely can > > >> hear > > >>> > it > > >>> >> in true surround sound. We also have noticed that certain MCE > > >>> >> sources > > >>> > seem > > >>> >> to get detected okay but do not play in "surround sound mode" > > >>> >> properly > > >>> >> (especially with certain TV channels). In fact, they seem to play > in > > >>> >> some > > >>> >> weird left/right/front/back unbalanced audio mode. I believe all > of > > >> our > > >>> >> setups are using one of the versions of Creative's Audigy 2 > > >>> >> interfaces. > > >>> > It > > >>> >> is almost as if we need to put a "digital audio stream" analyzer on > > >>> >> the > > >>> > link > > >>> >> to see if the "audio type" information is being stripped out by MCE > > >>> >> for > > >>> > some > > >>> >> reason so the amp does see it. In the situations where we have > > >>> > experienced > > >>> >> problems, always forcing the receiver to one of its Dolby settings > > >> seems > > >>> > to > > >>> >> allow it to play well across all of MCE's sources and you can't > tell > > >>> >> it > > >>> >> isn't playing it "properly" unless you actually look at the > > >>> >> indicators > > >> on > > >>> >> the face of the receiver (the machines only use the MCE interface). > > >>> >> As > > >>> > for > > >>> >> a more technical solution, we still are investigating.... > > >>> >> > > >>> >> Regards. > > >>> >> > > >>> >> =D- > > >>> >> > > >>> >> Derek R. Flickinger > > >>> >> Interactive Homes, Inc. > > >>> >> > > >>> >> "Larry Li" <lli@austin.rr.com> wrote in message > > >>> >> news:MuGbc.36923$o_.6041@fe1.texas.rr.com... > > >>> >> >I can't get 5.1 Dolby Digital out of my new FMC-901 under Media > > >> Center. > > >>> > I > > >>> >> > tried to run InterVideo DVD player application standalone, and it > > >>> >> > put > > >>> > out > > >>> >> > 5.1 Dolby Digital just fine. Anyone know what could be wrong? > > >>> >> > > > >>> >> > I am using S/PDIF out. > > >>> >> > > > >>> >> > -Larry > > >>> >> > > > >>> >> > > > >>> >> > > >>> >> > > >>> > > > >>> > > > >>> > > >>> > > >> > > >> > > > > > > > > > > > >
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