Send stereo audio to center channel

I know I've done this before but can't remember how. I want to send the L/R audio to the center channel as a lower volume mono track. I thought all I did before was change 2/0 to 3/0 but it's now not working.

?Update: Well, i figured out it is wired correctly because if I go into "gaming mode" it works properly. I have the problem when in entertainment mode or audio creation mode. I tried to replicate all the settings in the gaming mode into entertainment mode but still no go.. Update 2: I uninstalled all x-fi sofware and took out anything in the registry. After reinstalling, it worked like normal. I then started fiddling and somewhere in my "fiddling" process I noticed?the sud?wasn't working anymore. What was happening before is now mirrored back to the Suroundleft/sub. So now the subwoofer is playing whatever the SL is playing and the sub channel plays nowhere. I went into Game mode and it worked untill I went into the?bass management. hmmm..
Message Edited by jdamore on 02-27-200705:36 PM

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When I play the clips on the timeline the audio is perfect in both channels. So somewhere in the rendering/output process I loose the right channel.
What am I missing here?
Thanks in advance.

Hi and thanks for all input.
Yes I use a mono mic, but the camera puts the sound on both channels.
When I play the timeline I hear the voice in both channels.
The timeline audio track shows waveforms on both channels.
Here is a pic of the timeline:
The project is corrupt somehow. I just tried creating a new project with the same video files and made a short flv out of it and it comes out OK.
I will try to redo this one which leads me to another question which I will post in another thread if not already answered.
Thanks for your input.

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Hi,
facing massice transcoding issues when exporting a project I had to analyse the involved video/audioclips...
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I've posted this on Quicktime's website, but it doesn't seem to be a problem with other soundcards. When playing a Quicktime7 movie with 5. audio, the center channel is silent on my Audigy card. Games, etc. all utilize the center channel just fine.
I don't know who is to blame, but it's really really annoying. Creative should work with Apple to make sure things are 00% with regards to this.
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"Up Mix" from 2-channel "Stereo" audio content to 5.1/7.1 Surround

Hello,
This is a feature that I had strongly hoped would make it to Media Center in Windows 8, but didn't. Please consider this for a future update and/or the next version of Windows...
Feature Request: "Ability to Configure Stereo Up-Mix Capability in Windows Media Center and/or Windows Media Player from 2-channel Stereo to 5.1/7.1 Surround so Stereo MP3/WMA audio files output to *all* speakers in my system, not just the left and
right main speakers."
More information:
My audio content (MP3s, WMAs, etc.) are of course all 2-channel stereo format (left channel, right channel). My home theater PC outputs to my home theater receiver (which is a 2012-model Sony 5.1/7.1 receiver) via HDMI. When I play
2-channel music (MP3s, WMAs, etc.) from Windows Media Player (WMP) and Windows Media Center (WMC) both in Windows 7 and Windows 8, I only hear music from the left and right main speakers, *not* the subwoofer not the rear surround speakers.
In order for this to happen, WMP/WMC would need to "up mix" the stereo signal to take full advantage of my physical speaker configuration (as specified in my Windows' Playback Devices configuration, which Windows is able to discern from the capabilities of
my receiver). Media Center even has an Audio setup in which the end user configures the audio configuration to either Stereo, 5.1, or 7.1 yet music is still output over only two channels!
I would like to see WMC/WMP either "automagically" perform the "up mix" or provide the user with an option to enable/disable it when 2-channel Stereo audio content is played.
Too difficult? Rhapsody.com already accomplishes this with its online audio player! Note that my audio equipment has the capability of forcing output to two channels between the PC and the receiver, which my receiver will then up-mix, but this
requires physically maintaining a dip switch and also several button presses on my receiver's remote... and this physical configuration must be updated each and every time I switch between audio and movies. Too much work when it could be accomplished
automatically by WMP/WMC!
Thank you for your consideration of this feature request!
-Tretchie

The ability of windows to better control audio channel output is definitely an issue that needs to be fixed. It's really basic in this day and age where everyone and there mother has more than two speakers (i.e. 5.1 or 7.1). I understand that certain media
players, or certain decoders/channel mixers can be a workaround for this problem. But that's not enough. Today, we have many different sources for audio that are not just files on a computers:
1) Video/Movie files on computers (played through media center, MPC-HD or other)
2) MP3s/audio (played through same)
But there is also:
HTML5, webpages, Netflix, Amazon TV, Flash players, silverlight, etc. etc.
Hence why windows needs an option at the level of windows audio decoder to better control channel outputs over LPCM-HDMI! Either Mirroring L/R outputs to rear/side speakers, or, formal upmixing algorithms like Dolby Pro Logic etc., applied before
outputting over HDMI (Note I am NOT talking about bitstreaming!)
This is a trivial problem using WASAPI or ASIO. Why has windows audio not been properly updated since Windows XP!!
Recently, HTPCs and Media Centers are becoming many households primary source of entertainment.
Examples of some issues:
1) With no bitstreaming at all:
- Configuring HDMI audio "Playback device" to 5.1/7.1, and,
- Using a software decoder/media player to decode Dolby Digital, DTS, DTS-True HD, or Dolby True HD, and sending the data in LPCM over HDMI to the receiver/soundbar
-> works totally fine for outputting 5.1/7.1 surround from those sources
-> windows (i.e. software) completely fails in any ability to upmix 2.0 stereo sources to 5.1 or 7.1, or even mirror L/R channels to rear/side L/R channel for more room filling sound. Both these options should be available - upmixing with Dolby or other
for videos and mirroring/doubling the channels for music/MP3s.
Instead, windows audio sends silent channels over LPCM/HDMI when playing a stereo source. This has the added awful effect of not even letting my receiver upmix/mirror the outputs.
Hence, we need the ability to duplicate (for audio) and upmix (for videos) the L/R channels in a stereo source to the Rear L/R and or Side L/R channels through windows audio "playback devices" configuration before outputting over HDMI-LPCM!
In the day and age of 5.1 and 7.1 speakers this seems like such a BASIC feature that is missing.Otherwise, so many of us with an HTPC in our living room as our main source of media can't play music mirrored
through all our speakers, or watch videos with upmixed audio.
HDMI is the new standard, so this should really become an option.
I've done a fair amount of research on this problem, and do not believe there is any solution short of switching to optical (which I do not want to do because it can only carry 5.1) or, buying a fancy receiver instead of a soundbar with discrete rears and
a subwoofer (which I have) to do the mirroring/upmixing for me.

Accessing center channel in Sony AVCHD video AC3 audio (5.1 surround)

I have tons of video shot on Sony HDR-CX7 and HDR-CX12 camcorders (AVCHD) in 5.1 stereo. iMovie '09 and Final Cut Express import the audio as two channel stereo, which is normally fine for a consumer app.
I use a Sony wireless microphone to record interviews, and I normally set the camera to record only the monophonic microphone audio. But, there is also a setting to let the camera record 5.1 stereo from it's built-in microphone, and use the wireless mic as the center channel audio.
I have footage recorded this way, and I find that when I play it back in stereo, I get a slight delay/echo caused by the wireless mic recording voices, and the camera recording voices (slightly offset). I cannot use the audio this way.
I want to extract the center channel audio from the AVCHD .mts files. I can then line that audio up with the video in Final Cut Express (or even overlay it in iMovie '09).
Does anyone know of a free utility that can strip out audio from AVCHD files?
It looked like Handbrake might work, but it errors out when it tries to convert more than two channel audio.
I believe the AVCHD audio is AC3 format, so if I can strip that out, Quicktime is able to mute the other surround channels.
Any tips?

Here is my current status, and a work-around method to accomplish this.
First, using "ffmpeg" it is possible to extract just the .AC3 audio stream from a .MTS AVCHD camcorder file. I have tried to do this with the Mac OS X GUI version, ffmpegX, but it errors out. It looks like it is sending the wrong parameter to ffmpeg internally (or perhaps it is using a different ffmpeg command I have on my machine). Anyway, the command looks like this:
ffmpeg -i 00000.MTS -acodec copy audio.ac3
That will extract just the audio stream from within the MTS file (which is an AC3 file). By default, you cannot play .AC3 files in QuickTime. It turns out, I had "Perian" installed, which is an extension for QuickTime that allows it to play a bunch of other files. One of the settings was a Stereo mode, which was causing anything I tried to play mix down to stereo. Aha! So, I could toggle that off and actually get to the audio track I wanted.
BUT, since native Mac OS X does not read .ac3, my workaround is to again use ffmpeg to convert the .ac3 file to a .aac:
ffmpeg -i audio.ac3 -acodec ac3 -ab 512k audio.aac
Since the source AC3 file was 448kb/s, I just manually chose 512k as the conversion rate, so it shouldn't lose too much quality. That value can be changed to decrease file size.
The end result, "audio.aac", is now a 6 channel 5.1 audio file. You can open it in QuickTime, and go to Window->Show Movie Properties then select the "Sound Track" track, and the "Audio Settings" tab of that track, and you will see tracks 1-6 (Left, Center, Right, etc.). You can toggle the tracks off to get to the one you want (in my case, just Center).
From there you could export this out to a file with just the track you selected, or drag the .aac file in to Final Cut Express.
If you drag in to Final Cut Express, you will see it takes up five audio tracks. I drug this under the original imported video track, and was able to mute the ones I did not need. I also found I could unlock the audio from the video, and then delete the ones I didn't want, just to clean up the edit window a bit.
The end result is now I can import the AVCHD file in to Final Cut Express, and bring in this converted AAC under the video to access just the center audio I wanted.
When I have time to streamline this process a bit more, I will update this topic.

Audio Center Channel gone

Hi there!
I have been trying to work this problem out for some time without success, so I hope somebody here is able to help me.
I recently finished a project in CS 5.0.3 containing a lot of clips coming from DVDs which contain 5.1 sound which Premiere neatly converted to stereo tracks. Today I opened the project again to make some final changes only to find that the audio was not working as it did before. Suddenly the downmix Premiere does is missing the center channel. If I import a new clip an manually deselect all of the other channels only then I can hear the center. I tried creating a new project but it behaves just the same: the source monitor seems to playback the sound without the center, but if I drag the clip to a stereo track it the downmix seems correct.
This is all very odd, considering that nothing was changed. Maybe some external codec that has to do with how Premiere downmixes the audio? Hope somebody can help me out with this.
Thanks, dave

JSS1138 wrote:
Dragging the clips which contained a 5.1 mix to a stereo track
To the best of my knowledge, that is not possible. A clip will only go on a track of the same type.
These are mpeg2 files containing an ac3 6-channel mix. Previously Premiere seemed to handle them as stereo tracks (the information on these tracks that I imported a month ago still reads "Compressed - Stereo", but Modify->Audio channels reveals there are 6 channels only two of them are selected L & R). If I now reimport any of these tracks Premiere suddenly says "Compressed - 3 Stereo". I suppose that this difference in handling the ac3-audio has resulted in the missing tracks.
Could anybody tell me how their version of Premiere handles files with ac3 audio?
Does Premiere rely on any extrenal codec to decode ac3 audio? It might have been that this codec was updated on my machine and now produces a different result?
Thanks again, dave

Audio bleeding to center channel from left main on X-fi Elite

Erg! I was testing to see if I would like the x-fi as a pre/pro for about a week now. I?have been using the digital out since?I got the card an?it was working great for some time.. Now, using the analog outs, the center channel doesn't work and left ch. bleeds into the center. In the THX setup, If I play noise to the center nothing happens but play the left main it comes out of the left and center. I have the x-fi feeding into the Ext-Decoder source of my denon so its basically just being used as an amp. X-fi is configured to internal decoders with 5.. All the features are off for debugging(crystalizer,3D, ect..).
I fired up the THX optimizer in the Cars dvd to test DD and DTS and same result(theatertek, windvd8). It does the test tone for each speaker and when it gets to the left main it also comes out of the center. When it sends test tone to center speaker nothing plays. Its like my cables were crossed (somehow )
I switched the settings over to 4. in x-fi and it properly sends center ch. to left and right mains.
Am I missing a step?
I made sure control panel was synchronized to X-fi just in case. I have tried uninstalling and re-installing drivers and s/w (XP).
Maybe my card went bad ? its only been 5 monthsAny ideas what to look into?I have been searching for a long time now and couldn't find anything on creative or avs. Thanks for the help!

?Update: Well, i figured out it is wired correctly because if I go into "gaming mode" it works properly. I have the problem when in entertainment mode or audio creation mode. I tried to replicate all the settings in the gaming mode into entertainment mode but still no go.. Update 2: I uninstalled all x-fi sofware and took out anything in the registry. After reinstalling, it worked like normal. I then started fiddling and somewhere in my "fiddling" process I noticed?the sud?wasn't working anymore. What was happening before is now mirrored back to the Suroundleft/sub. So now the subwoofer is playing whatever the SL is playing and the sub channel plays nowhere. I went into Game mode and it worked untill I went into the?bass management. hmmm..
Message Edited by jdamore on 02-27-200705:36 PM

Center channel audio bleeding into left channel

When working on the audio mix for a project I discovered that dialogue would bleed into the left channel for some reason although the panner is set to center exclusive for that track. Can anyone else replicate this problem or can an expert chime in to confirm if this is a bug? It's definately bugging me
EDIT I am on 2014.2

with Premiere Pro CC 2014.2, build 8.2.0, I do not have any success with the center channel isolated with the stereo or mono audio
how about a work around with using an adaptive track, then channel output map the stereo input 1 and 2 both to output 3 (center channel)

Recording audio from a Channel Send

I've done this before, but I can't seem to do it again.
I am trying to record audio from one channel (which is using an audio instrument) to another channel (an audio channel) using an audio send. I am not having a problem setting up the send. I am able to hear the audio correctly and independently on both channels. The problem occurs when I try to record the audio, because there is no "record" button on the channel header for me to arm the track. The track is set up as a "record-enabled" track, but in the space where the other tracks have the record button, there is just a empty space on this tracks header. Does anyone know why this is happening? Any help would be greatly appreciated.
Thanks.

Well,
I seem to have found the problem. It appears that "audio tracks" will not allow you to arm them for recording unless there is a possible real audio input device connected to the computer. I plugged in my Snoball mic, allowed Logic to set it up as a device, and the record button magically appeared in the track header.
Hope this helps anyone else who is having a similar issue.

Stereo Audio channel turns to mono when I close and re-open the project

Hi there,
when I import a random video file with stereo audio channels and put it to the timeline (after peaking), everything works allright - the recording level window shows me the left and the right audio channel.
But when I save and close the project in order to re-open it directly, I only got a mono audio channel (left) and the stereo is away in my timeline and recording level window. The preview of the imported video ist still ok with stereo sound.
Is this a bug ? What can do? Please help me.
Thanks a lot

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[Solved] How to keep the channels of stereo audio "as is"?

I'm using a 5.1 surround sound system with ALSA/PulseAudio. I'm using HDMI to transmit to the receiver to power all speakers up. It works for movies without any issue especially after I passed "audio-channels=6" to mpv. But I notice that when I play a stereo audio, the sound comes from all speakers / channels. For example:
$ aplay -c 2 /dev/urandom
Playing raw data '/dev/urandom' : Unsigned 8 bit, Rate 8000 Hz, Stereo (but all six speakers are working)
Does PulseAudio remix the audio? It's a nice feature for minimal multimedia speakers. But for some audio, it sounds better by just using to 2 channels as it recorded, and my receiver has enough DSP stuff and audio effects to remix the audio and to use all my channels (i.e I don't want to double-remix the audio). It should use the channels as it recorded. Is there a way to keep the channels of stereo audio "as is"?
Thanks for any advice.
Last edited by biergaizi (2015-04-05 05:31:07)

The "enable-remixing" is the setting the OP is looking for. It will disable remixing completely if set to "no", with the drawback that, say, 5.1 audio won't be downmixed to stereo if one only has 2 channels.
Disabling remixing globally seems to have weird side effects, I couldn't get my front connectors working after disabling it.
What I did was splitting my 7.1 device into a 5.1 and a 2.0 virtual devices, leaving the global remixing setting at default. Then I disabled the remixing for the 5.1 virtual device, while letting it remix for the 2.0 one.
So now when I want to remix, I just select my 2.0 device, and if I don't, the 5.1 device (or rather, in my case I actually have a 5.1 and a stereo device connected). The example is on the wiki

Send stereo audio to center channel

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