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Multichannel LPCM audio playback
arnymars
post Jun 1 2012, 06:20
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Can someone suggest soft audio or media player that can directly play 5.1 LPCM audio? Pls don't tell that any player can, because in my experience NONE can. What plugins should I use to enable Foobar2000 play 5.1 LPCM?

Also, what utility can show media info data of a multichannel LPCM file? I tried MediaInfo and Gspot - they can't show any info about LPCM file.

What Media Server can transcode 5.1 Flac to 5.1 LPCM, and stream it to a Samsung BD Player over LAN?

This post has been edited by arnymars: Jun 1 2012, 06:21
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Ceniza
post Jun 2 2012, 15:09
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foobar2000 can indeed play 5.1 audio. That's what I'm using to play 5.1 FLAC files. It should work with DirectSound, but I would recommend the WASAPI plugin if you have at least Windows Vista. It also depends on what playback device you select and your soundcard's capabilities.

For me it only works with Speakers as playback device. S/PDIF is limited to 2 channels, but depending on the specific sound card it is possible to use it for 5.1 (it needs S/PDIF to be internally HDMI). If your S/PDIF goes out through coax or toslink, then it's not possible to use it like that at all.

As a matter of fact, I'm trying to push the WASAPI plugin to be changed in such a way that it will be possible to use my sound card (Xonar HDAV1.3) to do multichannel pass-through. What sound card do you have? What error do you get when trying to play the file?
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JimH
post Jun 2 2012, 22:41
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QUOTE (Ceniza @ Jun 2 2012, 09:09) *
S/PDIF is limited to 2 channels, but ...

That's not quite accurate. S/PDIF has bandwidth that is insufficient to carry uncompressed 5.1, but DTS will provide compressed 5.1 over S/PDIF.

Normally, HDMI is a safer choice for 5.1 sound.
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Ceniza
post Jun 3 2012, 08:43
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QUOTE (JimH @ Jun 2 2012, 23:41) *
That's not quite accurate. S/PDIF has bandwidth that is insufficient to carry uncompressed 5.1, but DTS will provide compressed 5.1 over S/PDIF.

Normally, HDMI is a safer choice for 5.1 sound.


The S/PDIF in my soundcard that goes out of coax and into the A/V receiver can carry 2.0 at 192 kHz. I just tested it, and it indeed works (receiver displays receiving stereo signal at 192 kHz and sound comes out of the speakers with no stuttering or anything). That means S/PDIF, at least in some hardware implementations, should be able to carry 4.0 at 96 kHz or 8.0 at 48 kHz if it's capable of 2.0 at 192 kHz in terms of available bandwidth. However, sending less channels at higher sampling will probably reduce overhead a little.

By checking information of the S/PDIF specification (http://www.hardwarebook.info/S/PDIF), 2.0 at 48 kHz is the maximum supported in uncompressed form (with a bit rate of roughly 3 Mbps), which means my soundcard and A/V receiver are nuts, but they like each other anyway.

S/PDIF comformant implementations, just as you said, do not have the bandwidth for anything beyond 2.0 (22.5 kHz is not an option here), neither is it possible to specify in the transmitted block that more than 2 channels exist (even if bandwidth allowed for it).

In short, and ignoring esoteric hardware implementations, bandwidth and block specification are the reasons 2.0 cannot carry uncompressed 5.1, or even 4.0.
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probedb
post Jun 3 2012, 23:24
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QUOTE (Ceniza @ Jun 3 2012, 08:43) *
The S/PDIF in my soundcard that goes out of coax and into the A/V receiver can carry 2.0 at 192 kHz. I just tested it, and it indeed works (receiver displays receiving stereo signal at 192 kHz and sound comes out of the speakers with no stuttering or anything). That means S/PDIF, at least in some hardware implementations, should be able to carry 4.0 at 96 kHz or 8.0 at 48 kHz if it's capable of 2.0 at 192 kHz in terms of available bandwidth. However, sending less channels at higher sampling will probably reduce overhead a little.


I can't find any information anywhere that says S/P-DIF allows anything more than 48KHz. Some will allow 24-bits but more often than not the last 4 bits are ignored. I very much doubt it's uncompressed LPCM.
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phofman
post Jun 4 2012, 08:33
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QUOTE (probedb @ Jun 4 2012, 00:24) *
I can't find any information anywhere that says S/P-DIF allows anything more than 48KHz. Some will allow 24-bits but more often than not the last 4 bits are ignored. I very much doubt it's uncompressed LPCM.


SPDIF commonly transfers stereo 192/24 in PCM bitperfectly and receivers support this mode.

Multiple channels cannot be transferred since the SPDIF format allows only two channels (I think it is two channels exactly)
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probedb
post Jun 4 2012, 12:51
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QUOTE (phofman @ Jun 4 2012, 08:33) *
QUOTE (probedb @ Jun 4 2012, 00:24) *
I can't find any information anywhere that says S/P-DIF allows anything more than 48KHz. Some will allow 24-bits but more often than not the last 4 bits are ignored. I very much doubt it's uncompressed LPCM.


SPDIF commonly transfers stereo 192/24 in PCM bitperfectly and receivers support this mode.

Multiple channels cannot be transferred since the SPDIF format allows only two channels (I think it is two channels exactly)


Can you point me at some references please?
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Posts in this topic
- arnymars   Multichannel LPCM audio playback   Jun 1 2012, 06:20
- - slks   I've never had a problem playing multichannel ...   Jun 2 2012, 12:22
|- - arnymars   QUOTE (slks @ Jun 2 2012, 05:22) I've...   Jun 6 2012, 20:06
|- - krabapple   QUOTE (slks @ Jun 2 2012, 07:22) I've...   Jun 6 2012, 22:22
- - Ceniza   foobar2000 can indeed play 5.1 audio. That's w...   Jun 2 2012, 15:09
|- - JimH   QUOTE (Ceniza @ Jun 2 2012, 09:09) S/PDIF...   Jun 2 2012, 22:41
||- - Ceniza   QUOTE (JimH @ Jun 2 2012, 23:41) That...   Jun 3 2012, 08:43
||- - probedb   QUOTE (Ceniza @ Jun 3 2012, 08:43) The S/...   Jun 3 2012, 23:24
||- - phofman   QUOTE (probedb @ Jun 4 2012, 00:24) I can...   Jun 4 2012, 08:33
||- - probedb   QUOTE (phofman @ Jun 4 2012, 08:33) QUOTE...   Jun 4 2012, 12:51
||- - phofman   QUOTE (probedb @ Jun 4 2012, 13:51) QUOTE...   Jun 4 2012, 13:33
||- - Ceniza   QUOTE (probedb @ Jun 4 2012, 13:51) Can y...   Jun 4 2012, 15:23
|- - andy o   QUOTE (Ceniza @ Jun 2 2012, 07:09) foobar...   Jun 3 2012, 08:18
- - LithosZA   QUOTE The S/PDIF in my soundcard that goes out of ...   Jun 3 2012, 10:12
- - andy o   SPDIF can carry 96kHz (tried myself over optical) ...   Jun 4 2012, 03:56
- - lvqcl   How can a player find samplerate and number of cha...   Jun 6 2012, 20:38
- - slks   Nope, I don't mean by S/PDIF - I've never ...   Jun 7 2012, 08:06
- - arnymars   Audacity allows to import multichannel raw files, ...   Jun 8 2012, 04:26
|- - phofman   QUOTE (arnymars @ Jun 8 2012, 05:26) Auda...   Jun 8 2012, 08:23
- - lvqcl   QUOTE (arnymars @ Jun 8 2012, 07:26) I al...   Jun 8 2012, 15:30
|- - grizz   QUOTE (lvqcl @ Jun 8 2012, 15:30) QUOTE (...   Sep 15 2012, 16:15
||- - krabapple   QUOTE (grizz @ Sep 15 2012, 11:15) I...   Sep 16 2012, 17:55
|- - Arnold B. Krueger   QUOTE (lvqcl @ Jun 8 2012, 10:30) QUOTE (...   Sep 16 2012, 13:31
- - wysiwyg   I'm upping this old topic with a suggestion an...   Feb 21 2014, 22:18
- - wysiwyg   I just got the answer on another forum. I'll s...   Feb 21 2014, 23:52


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