LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

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LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by gogol1 on Mon Oct 02, 2017 8:56 pm

When I use LAV audio + ffdshow audio on stereo speakers, the sound from Dolby AC3 48000Hz 6Ch 448Kbps is VERY LOW. This only occurs on the Realtek audio drivers release of March and newer.

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by Admin on Mon Oct 02, 2017 10:41 pm

Codec Tweak Tool > Audio Output > Select Stereo and enable "boost center" option

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by gogol1 on Tue Oct 03, 2017 12:35 am

This is not a panacea. Especially since I have a headset 7.1 and I use it so then others. On the Realtek 6.0.1.8036 driver, the sound is normal without any switching. If you install the latest driver on top of this driver, then it's all okay too. But if the system is installed from scratch and so I installed the newest driver (newer than 6.0.1.8036), then the sound is very quiet. Only K-lite has a problem.

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by Admin on Tue Oct 03, 2017 1:02 am

K-Lite is NOT doing anything wrong. It sends the audio to the audio renderer exactly as configured.

Windows itself also performs audio mixing. So you need to check the sound settings in the Windows Control Panel. Your speakers may not be configured properly after the fresh install.

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by gogol1 on Tue Oct 03, 2017 10:05 am

Problems only with Dolby AC3 48000Hz 6Ch 448Kbps codec. Other codecs (surround, 5.1, 7.1, stereo, mono) work fine.

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by Admin on Tue Oct 03, 2017 1:47 pm

6Ch = 5.1

Are all sounds low volume, or just voices? Voices are mostly in the center speaker channel, so wrong mixing (or dropping channels instead of mixing) can result in low volume on that part.

What settings are you using in the audio decoder, and which settings in the Windows Control Panel for your speakers?

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by gogol1 on Tue Oct 03, 2017 2:46 pm

Admin wrote:6Ch = 5.1

I know this

Admin wrote:Are all sounds low volume, or just voices? Voices are mostly in the center speaker channel, so wrong mixing (or dropping channels instead of mixing) can result in low volume on that part.

All. I have to increase the power of the speakers or set 100% on Windows.

Admin wrote:What settings are you using in the audio decoder, and which settings in the Windows Control Panel for your speakers?

ffdshow audio processor configuration => Volume (enable):

Matser volume increase to 100%
Central chanel increase from 100% > 152%

When use 7.1 headset, i disable "Volume".

LAV Audio Decoder = default settings (from box)

On Windows I set the slider next to the clock in the lower right corner:

30% speakers
75% headset

Nothing more

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by Admin on Tue Oct 03, 2017 3:58 pm

I mean the channel mixing settings:
In LAV Audio Decoder, on Mixing tab.
In ffdshow audio processor, on Mixing page.
In Windows Control Panel: Sound > Speakers > Configure

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by gogol1 on Tue Oct 03, 2017 4:29 pm

I'm not sure that he had found exactly what you need.




By default I did not change anything. Never. That's what I like about K-lite.

PS: Ok. Now I'm totaly confused. Dolby AC3 48000Hz 6Ch 448Kbps not work properly, but Dolby AC3 48000Hz 6Ch 384Kbps work fine. How is this even possible?

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by Admin on Tue Oct 03, 2017 4:47 pm

With those settings, all mixing is done by Windows (using the Realtek driver).

MediaInfo can show more details about the audio track. That may reveal a difference between those two.

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by Admin on Tue Oct 03, 2017 4:49 pm

This is also useful:
Windows Control Panel > Sound > Speakers > Properties > Enhancements > Loudness Equalization

Realtek settings should have the ability to boost volume based on which output connection you are using, speakers or headphones.

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by gogol1 on Tue Oct 03, 2017 5:43 pm

I found two "stable" version Realtek drivers where everything works without problems:

Realtek 6.0.1.8036
Realtek 6.0.1.8186

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by Admin on Wed Oct 04, 2017 2:05 pm


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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by notcyf on Wed Oct 04, 2017 4:32 pm

You're actually running a very old version of the Realtek driver. I'm sitting on 6.0.1.8245 without issues.


Try this: https://www.tenforums.com/drivers-hardware/5993-latest-realtek-hd-audio-driver-version.html

I'm using the ones provided by Nahimic(without actually installing Nahimic) for MSI Mobo's. These won't work on other motherboard brands. The problem is that the issues that arise usually exist with the additions the motherboard manufacturer has made to the Realtek chip. All that the Realtek chip does is DAC. The actual used amps and shielding is done by the manufacturer.

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

Post by notcyf on Fri Oct 13, 2017 3:12 pm

I'm not sure if these will fix your issue, but here's some more recent Realtek driver that might fix your issue: https://www.dropbox.com/sh/wrn8wml7wn11c40/AAAGfpTCTi-EvBr9QHhpTh_Ya?dl=0&preview=8261_FF03_PG463_Win10_TH_RS1_RS2_Win8.1_Win8_Win7_WHQL.zip

These are provided by Nahimic(as said in above post) but they might work on other Motherboards since they contain the same hardware_id's (usually). If it doesn't work, it won't install anyway.

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Re: LAV audio + ffdshow audio = very low sound Dolby AC3 48000Hz 6Ch 448Kbps

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