Audio: LFE and Center channels being switched

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Faris Ruhi

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  • Joined: Thu Oct 31, 2013 8:35 pm

Audio: LFE and Center channels being switched

PostWed Mar 18, 2015 10:45 am

Hey there, I have a Decklink 4k Extreme Card and I've just begun to capture games.

I've noticed that when capturing from the PS4 (using HDMI), the LFE and Center Channel seem to be switched. Now I know I can switch the channels after capturing, but the thing is the output coming from the card is also doing the same thing, meaning when I'm playing, I can't hear the stuff that should be on the center channel at all, which means all dialogue, many sound effects etc, which is a problem. If this was one of the surround channels I probably wouldn't have any issue with it, and fix it in post.

When my PS4 is connected to an AV receiver or TV, audio is perfectly fine, I can hear all the contents of the center channel, Decklink seems to be interpreting the 5.1 audio wrong. I tried capturing in stereo as well, but that doesn't fix the problem, and I've tried both the 7.1 and 5.1 options in the ps4.

This is through both Blackmagic Media Express and Adobe Premiere Pro CS 6.

I figured that maybe this was discovered already and updated, so I tried to update my desktop video version, but the thing is doing that seems to cause problems, and just shows a black screen for the ps4, but outputs the video to the tv okay.

So currently I'm using the latest version that allows me to capture video properly, which is Desktop Video 9.9.6.

So any way to adjust or fix this somehow.

Edit: Also for the heck of it, installed the new desktop video software, captured a clip (meaning a black screen) with the audio, the audio still has the same issue, LFE and Center channels are switched, and the output through Media Express also seems to have the issue since again I can't hear any dialogue (which I know is there when I can obtain it in Premiere by switching the LFE and Center channels).
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Tony Rivera

Blackmagic Design

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Re: Audio: LFE and Center channels being switched

PostFri Mar 20, 2015 3:24 pm

I'd suggest sending an email to your regions support office so we can take a closer look into this.
Support: http://www.blackmagicdesign.com/support
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Rob Cork

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Re: Audio: LFE and Center channels being switched

PostThu Mar 24, 2016 2:36 am

I'm having this exact same issue while trying to capture video from my Xbox One. Center and LFE are swapped. I've emailed support and they just say that it must be coming out of the Xbox that way and my Denon receiver is somehow interpreting it correctly but the Intensity Pro 4k isn't. Seems fishy because if the Denon is hooked up to the Xbox directly, the audio is correct. If i connect the Denon to the HDMI-out of the Intensity Pro 4k, the channels are swapped. For now i'm using ffmpeg to remap the audio channels correctly but it's a pain in the process and the product should just work as advertised.
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Erwan Robert-Thomasson

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  • Joined: Sun Mar 10, 2013 3:06 pm
  • Location: Paris, France

Re: Audio: LFE and Center channels being switched

PostThu Mar 16, 2017 11:33 pm

hi,
the problem is still here. i just got a 5.1 setup and can't use nor the sdi nor the hdmi audio embeded for 5.1 audio, center and lfe are swaped...
gonna have to get a dac...
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Xtreemtec

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  • Joined: Wed Jan 02, 2013 11:48 am
  • Location: The Netherlands

Re: Audio: LFE and Center channels being switched

PostFri Mar 17, 2017 8:42 am

You could run it trough a decimator MD-HX. In this box you are able to swap audio channels in the hdmi or sdi..
Even can use this box to loop trough to your receiver and Go SDI Out to your decklink Card..
Daniel Wittenaar .:: Xtreemtec Media Productions ::. -= www.xtreemtec.nl =-
4K OBV, ATEM TVS HD, Production Studio 4K, 2M/E Broadcast Studio 4K, Hyperdeck Studio, SONY FS7 4K, JVC HM700 Full HD Camera
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Erwan Robert-Thomasson

  • Posts: 52
  • Joined: Sun Mar 10, 2013 3:06 pm
  • Location: Paris, France

Re: Audio: LFE and Center channels being switched

PostFri Mar 17, 2017 8:53 am

thanks xtreemtec,
that's what i need indeed, but feel a bit pricy just to correct a bug...

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