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Discussion Starter · #1 ·
With a new public release due out shortly and lots of problems relating to sound on the forum I thought I'd take the time to explain DScaler's support for sound both now and going forward.


the bt848 chip is very flexible in terms of what it can do for video and there is very little leeway for card hardware designers to muck about with the video end. This is why it is usually very easy to add support for new cards based on the bt8x8 chips.


For sound things get much more complicated.

The Different ways sound is supported


1) Mono sound from the tuner is passed to the bt chip. If you have a mono card then this way should work. I will try and resolve issues related to sound on mono cards.


2) NICAM Stereo (Europe) MSP Chip. These cards have an MSP chip and some support is in DScaler for these cards. I have no test setup for this but accept patches for changes to get NICAM working. I have reports that it works on some European NICAM broadcasts. I think it doesn't work on UK Nicam.


3) BTSC Stereo (US) MSP Chip. There is currently no support for these cards. After a bit of research it seems that these cards will only play stereo when in a mode that is not implemented in the bttv code that the sound support was taken from. This will be addressed in later versions. There is already a large backlog of changes required but this is on the list.


4) Other. Some hw manufacturers have used other chips and ways of supporting sound. These are not supported now and probably won't be unless someone else writes or ports the code. Patches to support specific cards will be accepted once I have implemented a new design for sound support. This should make it easier to add support for new cards.

Workarounds


The most basic workaround is not to use the onbaord tuner :)


This is one used by most of the users of DScaler and explains why sound tends to take a back seat in priority.


Sometimes running the supplied TV tuner app before or after Dscaler can help. Note that if you are using an hauppague card then Dscaler 3.1.0 will include a card type of "Standard bt848 (No init MSP)" that will not touch the MSP on startup which should make the card behave as it did in version 2.3.0.

Using the Mixer


DScaler now also supports controling the mixer and can mute lines when channels are changed or when DScaler exits.


The mixer set dialog canm be accessed from Hardware/Audio Mixer Setup.


It allows you to specify which mixer lines are to be controlled by DScaler and which ones are to be unmuted when a given input is selected.


If "Reset Mizer to Initial Settings on Exit" is selected then it returns the mixer to the state it was when Dscaler started, if off then all the mixers lines that have been selected are muted on exit.

Still got a problem


We should use this thread to collect all sound issues and to categorize peoples problems into


1) Bug I will fix now

2) Bug I will fix later

3) Bug I will never fix

4) Not a problem


John
 

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Discussion Starter · #3 ·
The STB TV cards have a different sound chip which means that they fall into category 4 in board design and that support for them will not be added by the main DScaler team. We would welcome any developers who want to add support for these cards. The code for the support of these cards is in the bttv driver but porting that code to DScaler is not trivial.


John
 

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Forgive the clarification request, but I want to see if I've got this right.


I have a standard PCI WinTV card. I'm assuming it has a BTSC Stereo MSP chip. The code incorporated by dscaler for doing sound does not implement what needs to be done to enable stereo sound on this card.


The WinTV app that comes with the card knows how to make the proper calls to setup the card properly. If you run and exit some WinTV app, it will leave the card in the proper setup.


When dScaler runs, if you can convince it to leave the card alone (no init MSP), you'll get stereo sound fine.


I remember reading a thread with a complicated set of steps to get (stereo?) sound on dScaler. With the new release, is it just a matter of running WinTV2000 and then exiting it before starting dScaler (with 'no init MSP')? Or is there more to it than that?


Thanks for the clarification!


Mike
 

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Discussion Starter · #5 ·
Mike


I hope the workaround will work as you suggest with the new version. The init MSP is basically what broke that work around in the first place. (The reinit seems to be required for European users however)


John
 

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Can you tell me what compiler you are using to build DScaler with and are there any existing compilation instructions out there? I'd like to see if I could port the code for sound on my card from the bttv driver (which works). I'm used to dealing with Makefiles and such (from Linux), and am not familiar with Windows compilers.
 

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Discussion Starter · #7 ·
Lou


To compile DScaler you need MS Visual Studio 6.0 with the processor pack add-on(free) which in turn requires service pack 5.


There is a readme in the DScaler directory of the source zip that describes everything you need to compile all the source.


We already have someone looking into porting the code from bttv but work will not start until we have a clean design for card support, this is a few weeks away at the moment.


John
 

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Sigh, I hate asking RTFM questions like this, but I haven't been able to find a solution anywhere.


I have a Hauppauge PVR card (Philips 1216 tuner, Std Brooktree 878) and can't get any sound through Dscaler at all. All the parameters are correctly setup in the Hardware info, and I'm using the latest drivers. If I set the audio input to tuner and the MSP/Radio setting to Terrestial TV, I get hiss coming through the speakers. ANY other setting (and I think I've tried them all) produces no sound at all.


I tried using Std Brooktree 878 (No init MSP), running WinTV2000, closing that then opening DScaler. This produced exactly the same situation.


I have the audio from the PVR linked to line-in on my sound card. I set all the tabs on the mixer to 'line-in'.


Audio works fine using the WinTV2000 app, but I've run out of options for DScaler. Has anyone managed to get audio to work on this using a PVR card?
 

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I have a Hauppauge WinTV PCI-FM (bt878). After starting up DScaler 3.1.0, sound is horrible. I have very loud noise with the selected channels sound somewhere behind it. When I set it to FM radio and then back to TV terrestrial, sound is fine, but after a short while, it suddenly drops back to the state it was in at startup. It seems to me that DScaler is resetting the sound chip from time to time or forgets about some settings.
 

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charleski wrote:
Quote:
I have a Hauppauge PVR card (Philips 1216 tuner, Std Brooktree 878) and can't get any sound through Dscaler at all.
I'm in the same boat. Any solutions would be greatly appreciated. -Pat
 

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Quote:
Originally posted by paddy
charleski wrote:I'm in the same boat. Any solutions would be greatly appreciated. -Pat
Any solution? Well how about using a VCR as the tuner and feed it to your capture card. Then use the VCR audio to feed your reciever.
 

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John,


Thanks for the update as I've been scratching my head why the audio output with my IOMagic PCPVR and Dscaler 3.1 has always been mono. This might help explain why IOMagic always insisted the NTSC tuner on the card supports stereo.
 

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STB Tv Tuner Pro v2.13 (no FM)


Video and Sound worked in Dscaler as long as the STB software was installed on the machine. This was great in Win98, but in WinXP the STB software will not install correctly nor will it run. So this means no sound in Dscaler.


This leads me to believe one of two things:

1. The STB software initializes the hardware at System start up, and this allows Dscaler to take advantage of the hardware at any time.

or

2. Dscaler merely calls on the vxd's, ocx's, dll's (that are present due to the STB software install) at program run. In XP these files aren't all there.


BTW other capture software runs in XP, but won't even let me select the STB card as a device - says "that device is in use...". I just wonder what driver files all these programs are looking for, or need to be already initilized in order to see the hardware.:confused:


Hammer
 

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Quote:
Any solution? Well how about using a VCR as the tuner and feed it to your capture card. Then use the VCR audio to feed your reciever.
I'm already doing that! Believe it or not, I'm not that stupid! :rolleyes: I was wondering if there was an ALL HTPC solution. I don't want to have to turn On the VCR tuner, tune to the correct channel, and switch the AVreceiver function to VCR. I'd like to be able to tune the video AND AUDIO signal using the Hauppauge PVR card's tuner. I know, call me "picky" :D -Pat
 

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I have a Pinnacle PCTV Pro card. All is working fine when I am receiving in Pal B/G, but with stations broadcasting in Pal D/K I have only noise. How I can switch DScaler to receive in Pal D/K? Thx for help.
 

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Quote:
Originally posted by Shadowdancer
I have a Hauppauge WinTV PCI-FM (bt878). After starting up DScaler 3.1.0, sound is horrible. I have very loud noise with the selected channels sound somewhere behind it. When I set it to FM radio and then back to TV terrestrial, sound is fine, but after a short while, it suddenly drops back to the state it was in at startup. It seems to me that DScaler is resetting the sound chip from time to time or forgets about some settings.
I had this same problem - if you set the sound from stereo to mono it will work fine - but instead of the drop-outs to static, I get drop outs from 2 channels to one.


(make sure you turn off the automatic detect stereo also).


I had the best luck with the Phillips NSTM_M (Mk2) for my tuner selection. (Hauppauge 401 Bt878/US)


Chris
 

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Yesterday I stumbled into dscaler and I was amazed !!!! its an excellent program, actually the best I've seen so far

However there is no sound no matter what I've tried


the programm states that I have no msp hw

the trick on running the original prog first doesnt work ... (am running win2000)


I have the PixelView Play TV + FM

878 chip and Philips fm 1216 tuner


any help would be appreciated
 

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Discussion Starter · #18 ·
Just to let you all know that the sound issues are currently being worked on by the finest DScaler minds. The way it is looking at the moment we should be able to support sound on pretty much every card with troubleshooting being easier as well hopefully.


All these changes will take a while to test and sort out but we are progressing.


I would expect some test releases fairly early in the new year.


John
 

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after posting the last message I tried something (accidentaly?)

I have tried the atv2000 prog which is also a nice one...

when u exit the app it leaves an icon in the task bar and the prog is still active

if I launch dscaler it works with sound !!!!

not the best solution

but it will do for now
 

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quote:

--------------------------------------------------------------------------------

Originally posted by Shadowdancer

I have a Hauppauge WinTV PCI-FM (bt878). After starting up DScaler 3.1.0, sound is horrible. I have very loud noise with the selected channels sound somewhere behind it. When I set it to FM radio and then back to TV terrestrial, sound is fine, but after a short while, it suddenly drops back to the state it was in at startup. It seems to me that DScaler is resetting the sound chip from time to time or forgets about some settings.

--------------------------------------------------------------------------------

I'd been having similar problems after installing DScaler 3.1.0. After fiddling with the settings I stumbled upon ones that work at least in mono for my system with no white noise in the sound


To get it working I'm using

Settings -> Audio Input = Tuner

Hardware -> MSP/Radio -> TV Terrestrial FM-mono + FM-stereo

Hardware -> MSP/Radio -> Major Carrier = PAL I

Hardware -> MSP/Radio -> Minor Carrier = PAL B/G Nicam Stereo

Hardware -> MSP/Radio -> Mono

with no Auto Stereo adjustment


I've no idea why the PAL I setting works when intuitively I should be using PAL BGH but it seems to!


Cheers

Si


My setup is

WinTV Theatre

SB Live

Athlon 700

256Mb Mem

Geforce 256 DDR

DScaler 3.1.0 (Standard BT878 Card & Philips PAL Tuner)
 
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