Bit perfect music playback with GBPVR

[SoupSatchel]

I didn't notice sync problems, but I've been having that problem anyway with recordings so wasn't looking out for it, but thats another story.

I need to get My Music 3 working properly ie not crashing GBPVR.exe (GBPVR has a problem and needs to close type message). As I said I don't have much free time to play so I, perhaps stupidly, was trying two new things at once...Reclock and My Music 3.

I shall keep trying and will reprt back (I want to get this working because I've just given my posh CD player to my father..) I also had that aspect ratio garbage on screen problem that I believe you have too, but that's another other story.

Reclock looks like it might be the answer for bit perfect within GBPVR though, even if I have to turn off the reclock sync video side of it.

One day it'll all work like it says on the tin.....

[murphotronic]

I'm currently debating whether NVIDIA Pure Video 'Platinum' is worth the extra $20 just for DTS capability. I've been using a dedicated GB-PVR setup with a 2 speaker system (~12 years old) and am getting ready to buy a 5.1 system with DTS and Dolby. I'm not quite an audiophile, so even Dolby 5.1 will be impressive. However, if DTS passthrough can be brought into GBPVR support, well, that extra $20 could be well spent...


HTPC:
MSI K8NMG2-FID
AMD 64 3000
1 GBCorsair Value (2x512)
40GB IDE (OS+software)
160GB SATA (video, mp3s)
Asus DVD-ROM (noisy! <-- here's where I'd spend the extra $20)
Antec Overture Case (huge! - about to build my own, 1/2" aspen with brushed alum. front panel)

[daza67]

Murpho,

Even the most basic nvidia decoders support DD/DTS passthrough of 48kHz encoded material ie. DVD, DVB sources when you set the nvidia audio decoder to SPDIF output.

The problem is with 44.1kHz encoded material ie. most music sources, this gets resampled to 48kHz by windows kmixer.

Foobar integrated into gbpvr may be an option for bitperfect playback of audio see here: http://forums.nextpvr.com/showthread.php?t=15807

I recall this player is capable of kernel streaming output but have not yet tried it.

Daza

[SoupSatchel]

daza
You're right, reclock mucks up live tv, I get a kind of digital breakup. Even if I untick all the video processing boxes, sounds like it's trying to stretch the audio to fit the picture but instead it breaks up the audio signal, kind of jittery.

Ah well shall try foobar trick. Thanks for the link.

SS

[gEd]

IIRC, you have to manually select the kernel streaming module when u install foobar.

Here is some config info that I picked up some time ago.

Playback
-set “output data format” to the highest your card will support. If you don’t know, set it to 24bit. If sound doesn’t work when you hit play, change it to 16bit.
-check the “Dither” box, and set it to whichever sounds best (FIY – Strong ATH sounds best…

-DSP Manager
-Remove all components from the left pane
-Move “resampler (ssrc)” to the left pane
-Move “advanced limiter” to the left pane

-Resampler
-set target sample rate to 48000Hz

-Standard Inputs
-set “tag type to write” to ID3V2 and ID3V1
-check the box next to “VBR Bitrate Display”

-Output
-Select Kernal Streaming

[daza67]

Guys,

You need the foobar2000 ks plugin to enable bitperfect playback, get it here: http://www.foobar2000.org/components/foo_out_asio.zip

[daza67]

-Resampler
-set target sample rate to 48000Hz

Exactly what we are trying to avoid !

[gEd]

you can't AFAIK (without dedicated 44.1 hardware) so better to do it with a decent resampler and the correct application of dither.

[SoupSatchel]

ged

I believe it is possible to have all output not resampled ie bit perfect, but it's tricky to get it working with all the different demands in a HTPC. The test is a dts encoded wav file, if this plays and isn't just digital noise then you have bit perfect, any resampling and you get garbage.

SS

[gEd]

ah ok.

I always understood that you will always get upsampling and it is better to do it with a good resampler with dithering, rather than the crappy upsamplers often found in soundcards. With the settings I have above, foorbar certainly sounds better than anything else I have heard from a pc.

Good luck.