On Mon, May 31, 2004 at 11:22:10 +0200, Dominique Dumont wrote: > Philipp Morger <[EMAIL PROTECTED]> writes: > > > No AC3/DD sound: I have never been under any circumstances been able to > > play AC3/DD sound... best is getting an ugly "sound" that worst case > > blows my sound system.... > > I've never been able to get a sustained white noise. My A1 amp cuts it > off after 1/4 of a second. Well, I guessed that the "digital" stream gets interpreted as "analog" information, and either the amp cut the output or the digital stream produces no audio at all...
> Have you connected the analog lines ? (I did not) No, I don't have the cables... does the A1 even have the needed input (I never cared about that matter) > > DTS sound with jumps: DTS works almost fine, there are 2 issues: > > First: every ~5 seconds the sound jumps - I see on the receiver during > > the "jump" the display jump from "DTS dts" to "DTS pcm" and back, as > > soon as the display jumps back the sound continues... whole process just > > takes some ms.. > I've got no problem with DTS except that it's decoded as DTS from CD > audio (some kind of a fallback mode?) . I've hooked my sound card with > a coaxial cable. Not an optical one. > > "DTS pcm" means that there's no signal to decode or that the DTS > signal cannot be decoded. > > BTW, when DTS works, Do you get the orange DTS light (DVD source) or > the red DTS light (CD or LD source) ? I get the red, I also switched the optical in to the dvd input (thought it mattered, because I use the LD input), but it doesn't make a difference. I read that's because the "audio bit" is set, but when I manualy override the bit with the iecset command it still shows as "red dts" and ac3 still doesn't work. > > Second: Once I'm done playing dts, the stream doesn't get resetted, so > > any subsequential audio is assumed to be dts, so no more stereo sound > > until I switch input to another audio source and back on the amp. > > This is probably normal. See page 41, bottom right notes on your A1 > manual. But I gather you get red DTS light and not orange DTS light ;-) > Regarding this topic I found a mail in the archive that says, that it would "reset" the status to PCM... maybe this thing causes the "jumps" from dts->pcm->dts on my box - but it doesn't reset the status to ordinary "Audio Stereo", which seems a little bit strange. > > all the problems happen whether the sound get's played from harddisk or > > dvd / xine or mplayer - so I have to assume that it's some driver/amp > > issue. > > Yes. The Yamaha A1 seems very picky to decode AC3 or DTS. Since the A1 > is something like 5 or 6 years old, I wonder if some subtle changes > were introduced in encapsulating AC3 in SPDIF since then ... I read a mail [1] in the archive where a guy replaced an amp with a yamaha amp and run in the problem that ac3 stopped working... so yamaha is picky, yes - BUT, I do have a state-of-the-art dvd player... and the player is able to deliver the stream to the yamaha amp and the amp plays it nicely... so I doubt that the standard has changed... > > -- References: > > I saw someone called Dominique having a similar problem with a different > > soundcard but same amp regarding the dts/ac3 problem. > That would be me ... Yeah, I joined the list just a few days ago, and hadn't your email-address... As for now, I have to guess that nobody of the "digital out team" has an "Yamaha DSP A1", or anothre "picky" amp and therefore they couldn't get caught by this problem - I took a brief look in the AES definition - and for me it's a little bit black-magic, as I'm no sound-expoert; neither do I have the euipment to dump the audio signal not to say to compare the ac3 or dts header data to figure out what the dvd player delivers that my soundcard doesn't.... The question now is, how do we get the problem fixed? I would sure fix it myself if I were not such a lousy C programmer and would understand what this "channel status bits" would mean - but I don't. I can offer my assistance in testing to see if it "works for me", and I would love to consider my assistance in any other aspect I don't came up right know. Regards Philipp [1] http://groups.google.com/groups?q=ac3+alsa+yamaha&hl=en&lr=&ie=UTF-8&selm=3806ecf1.0207160129.1c78afde%40posting.google.com&rnum=1 ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
