Converting sound to mono

I have old 8mm video which I transferred onto my Mac through a pass-through with my miniDV cam.
When I play the clips in iMovie, I notice that only the bottom of the two volume level indicators shows any activity. I would like to convert the sound in the movie so that both tracks (left and right) play the identical audio - in other words, I'd like to convert this to mono.
Is this possible? Any suggestions would be most appreciated.
-David

Play the video in GarageBand.
You can then use GarageBand's "pan-pot" (..little knob which distributes the audio between left and right channels..) to move the audio to the centre (..i.e; play the same audio on both left and right channels).
Then export back to iMovie.
One can also do this with an external sound editor such as "Audacity", but that involves "extracting" the audio first from within iMovie, and exporting it, opening it in "Audacity", copying one audio channel to the other, then re-exporting and importing back into iMovie again!

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Hi, am using my ultrabeat as my drum machine in logic, i would like to route the kick drum to aux channel 1 for example, and to have the kick drum played in mono.
i have done this, and clicked the circle on the aux channel strip to make it a mono channel, but i don't think it is in mono as :
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2. the ultrabeat sends its sounds out of the ultrabeat as stereo pairs, does this mean i cannot make the kick drum mono?
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I don't use Ultrabeat, so someone correct me if I'm wrong, but since Ultrabeat sends out in pairs (3-4, 5-6, etc...), just pan your kick drum hard left, for output 3, hard right, for output 4.
As to why your Aux track is showing 2 led strips, even when turned to mono, I'm not sure. Works fine here. Do you have a stereo plug-in on the Aux channel? Try removing all plug-ins, and instrument inputs. Does it show one LED strip now?
Very few Audio Instruments allow collapsing to a mono version (that I'm aware of), some of Logic's instruments excluded. I would suggest routing the AI's output to to a mono buss. Then it will be heard in mono.

Change sound to mono to normalize audio of a movie?

Hi, newbie here. Sorry if this is obvious, just trying to learn & can't find this in the help docs so thought I'd ask here:
Without trying to sound like a whiner, it seems like no matter what DVD, TV, DVD player & recorder I've bought since 2000 I have to keep the volume remote in hand the whole time due to needing to turn up the sound to hear what the actors are saying then having to turn it down quickly due to explosions in the movie, loud background music, whatever (I live in an apartment so don't want to hear it from the neighbors).
I figured it might have to do with being forced to buy equipment with 5.1, surround sound, whatever.
I've tried a Surround sound Processor hooked to my TV but that didn't work.
So maybe I don't want mono as such but I just wondered what the best methods are for normalizing volumes for movies in APE7 if I rip amend and reauthor (and yes, the copies would just be for my own personal use etc. just my playing copies).
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For the problem with your listening enjoyment, you might want to recalibrate your system a bit. In most Hollywood-type movies, the dialog is mainly centered, with some spatial info and bleed to the Front Left & Right. This is where it should be, and the main reason for the Center channel. Most systems come setup with the Center channel attenuated about -6db. This means that the SFX, and usually the music, overpower it. Next the audio engineers punch UP the SFX and the music some more. This is often done for a bit of "shock factor," and to let your LFE channel really prove that it can work. What ends up happening is that the Center channel is now ~-9db to -12db down from the rest of the audio programming, i.e. very hard to hear, especially when the actors are whispering. By recalibrating your system to diminish the LFE a bit, and increase the gain of the Center channel only, you will likely realize a vast improvement in listening to most movies.
When I mix for DVD, I always work to keep the dialog clean, fairly centered (unless we need to explore the spatial relationships), fed to the Center, with about -3db bleed to Left and Right Front, and also make sure my music is way, way below the level of the dialog.
Obviously a test DVD and a good sound pressure level meter would be ideal for this, but you can do it via listening. The biggest hangup is that the controls for the receiver are usually ill-placed to get an idea of how it sounds from a normal listening position. It is best to attempt this with two people - the listener and teh person at the controls.
Now, you mention 5.1 audio. I do not believe that PE can Export, or author DD 5.1 SS. I can Import it, but the output will be stereo. Premiere Pro, with the SurCode plug-in, CAN Export DD 5.1 SS for authoring in Encore.
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How to convert stereo to mono?

First of all, I'm sorry if I'm posting in the wrong place, but I couldn't find any other sub-forum that was more appropriated.
I have a bunch of mp3 stereo files that I want to downsize. I'd like to make them mono and maybe lower their bitrate.
I'd like to know if there is a way to do that inside mac os X or if I have to use a specific software. If so, what soft do that better?
Thanks
Adriano

You can do it with iTunes. In its "General" preference, click "Import Settings", set "Import Using" to MP3 Encoder", set "Setting" to "Custom", set "Channels" to "Mono", and set the desired bit rate or quality.
Hold down Option and use "Convert to MP3" from the "Advanced" menu to select the files to convert. You can select multiple files using the Shift or Command keys.
The resulting files will be in the iTunes library. You can right-click and use
"Get Info" to find their location on the hard drive if you want to move them.

The sound of 'mono' tracks is broken after a reistallation

Evening,
I had to make tabula rasa of my Windows and after I re-installed everything I can't work with my old projects.
First I try to re-locate the files I used in my projects and it says 'The selected file cannot be linked because it has 1 audio channel(s) and the clip was created with 2 audio channels(2).' (I open the same .prproj file and try to link back the same .avi files I used.)
I managed to link them anyway after I opened the project, only to discover that whenever I try to play the clip, the sound of the videos turned to high-pitched screeching - but the sound of the stereo audio-only files is all right. This is how it looks and sounds when I open it and link all my files back:
PLEASE don't tell me to try to modify the files - those are THE files I used to create the project in the first place! Everything was perfectly fine, but after I reinstalled windows I suppose something is... missing from my system? Some codec, maybe?
I can't import those files into a new project either - I get the same screeching, even if I try to Modify > Audio Channels into something else before putting them on the timeline.
I am using 'Premiere Pro WDM Sound', and I don't have any other options. Installing and choosing ASIO4ALL makes ALL my sound disappear. I have Realtek High Definition Audio, latest driver. Windows 8. None of the devices are muted.
I recorder the files with BandiCam. MediaInfo describes the properties of the audio track of those files as:
ID                              : 1
Format                        : MPEG Audio
Format version            : Version 1
Format profile              : Layer 2
Codec ID                    : 50
Duration                      : 14s 928ms
Bit rate mode              : Constant
Bit rate                        : 320 Kbps
Channel(s)                  : 2 channels
Sampling rate              : 48.0 KHz
Compression mode      : Lossy
Stream size                : 583 KiB (3%)
Alignment                    : Aligned on interleaves
Interleave, duration      : 24 ms (0.72 video frame)
Interleave, preload duratio : 24 ms
Whenever I try to import them, Premiere processes them as '11025 Hz - 16 bit - Mono' with 1 audio track.

The results are mixed... What I'm doing:
Exporting the file's audio to wav
Renaming the wav to mpg
Importing it back with the original audio track disabled
Direct strim copy the file into another avi file.
What I'm getting:
The old files I'm replacing work all right... I recorder them with a while back using Chromatic MPEG 1 Video I Frame. That's really something already! Thanks! (Even though I still don't understand why did it have to happen, and I'll have to do it with dozens of files... ugh...)
And then there's the new files... I switched to XVID (MPEG-4 Visual Simple@L1, according to Media Info) while recording at some point, and those videos are not synched (are faster than the audios) in Premiere (but not VLC or Windows Media Player). Any ideas how to deal with it?

Convert Sound Files?

Hello everyone,
I have a large number of Mac OS 9 sound files, TV theme songs, commercials and sound bytes.
I would like to play them in OS X but they will not through Quicktime. The sound file icon is dark gray with green letters EXEC in the top left corner. Tried adding a .mov or .aiff extension to the file and tried to play through Quicktime....no luck.
Any ideas on how I can convert the sound files to play in OS X?
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Message was edited by: Apple Jack
Message was edited by: Apple Jack

Sounds (no pun intended) like your audio files are probably QuickTime compatible but they are missing the correct file extension. Adding .mov or .aiff will not fix it.
The icon shown in OS X is a Unix "Executable" file but we know that isn't true. Because the file extension is missing you may have to "guess" and also may need an OS 9 machine.
Most audio files from the OS 9 days were probably .wav and .au (System sounds used .snd).
If you want to explore you can send me a small example file via email using my screen name (left) @ mac.com and I'll do some testing when I have some free time.

MacBook Sound Card - Mono or Stereo?

Is the sound card (specifically, the external mic jack) of the MacBook mono or stereo? Thanks.

Thanks! I can't figure out, then, why my portable guitar amplifier (Rockman) will not play through my MacBook. It should be a simple thing. You connect a mini-jack stereo cable from the line out of the amp into the external mic jack of the computer. It works perfectly on my PC. But on the MacBook, there is no audio output whatsoever. GarageBand does pick up a signal that you can hear when playing back a recording, but it's a neutered signal and nothing like what you hear through headphones from the amp. I was told that it might be because the sound card of the MacBook is mono, and the Rockman requires stereo. But I guess that's not the case. Very frustrating! I'd like to record with my MacBook. Do you think this issue is worth a trip to a Genius Bar?

Convert stereo to mono, but with only left side

I have some mp3 files that are stereo, but I only want to hear the left. I know I can change the balance through System Preferences, but I want the left side to be coming through both speakers. Also I assume I could do this with Garageband, but there are a lot of files, and I'd rather not do that for all of them.
Thanks!

You don't want to hear the right channel at all or you want to combine both channels and listen to it with your left ear only?
You can convert the files to mono using iTunes.
iTunes prefs -> Advanced - Importing.
Click the drop down next to Setting and set it to Mono.
Now select the files you want to convert, then menu Advanced -> *Convert selection to...*
This will make a new copy of the selected files in Mono.
The original files will remain unchanged in iTunes.

Convert sound file to histogram

we hava a prject in last year called Voice Recognition we have incountred a problem that is how we convert the recorded sound to digital numbers in order to convert into histogram.
any one who has an information please tel us...thanks

I think you have to be a bit more explicit. The sound file is already defined in terms of numbers. These are typically amplitude samples coded as 16 bit or 8 bit with some simple compression (alaw/ulaw) on the 8 bit.
What other sorts of 'numbers' do you want?

How to convert false (dual mono) stereo files ?

I imported an enormous amount of regions from a Final Cut Pro project, and because the cameras each had mono mics but were recording audio in stereo, all the audio files are technically stereo, but contain only mono information.
So I've got hundreds of stereo-interleaved files in my Logic session, but each file contains only mono information, so my project is twice the size it needs to be.
Can anyone suggest a way to remove all that redundant information ? What I want to do is split all the interleaved files, then select all the .R files and delete them, but I don't see any way to accomplish this in Logic, other than file-by-file (I have 500 of them...)
Anyone been down this path ?
Thanks!
-James

Hey, thanks for all the suggestions, Seeren!
I'm not sure how your method is generating only .L files for you--when I split interleaved, I always get both sides... but not a big deal. It's easy enough to delete half the audio.
The real problem is getting the files replaced without losing all the arrange work: your method requires manually replacing the old stereo files with the new mono files in the arrange, which would be a ton of work in large projects like mine...
But... I did find a solution to this--it's not exactly elegant, though, because it requires some filename hacking:
Turns out if you have a reference to a stereo interleaved file in your project, and you replace it with a mono file of exactly the same length and filename, Logic will happily accept the substitution without a complaint. So the way to replace all the stereo files with the .L files is:
1) Copy the stereo interleaved files into split stereo, then remove the new split stereo files from the audio bin (but leave them on disk)
2) Close the project
3) Remove the original stereo files from the "Audio Files" folder, and delete the .R files.
...that's all easy... then...
4) Rename all those .L files, removing the .L so they have the same names as the original stereo files
5) Reopen your project--Logic will now refer to the new mono files, not the original stereo files
Step #4 requires some hacking to do efficiently: I used the command line to rename all those files quickly. There are probably utilities out there that could have done the job with a GUI, and AppleScript could probably do it, too.
Anyway... this works, if it's helpful to anyone else.
But ultimately I guess this is a feature request: it's cool that Logic makes it so easy to manipulate split stereo files as a single unit. But there are occasional times when you need to manipulate stereo files individually. There should be a track command in the arrange that takes a stereo track and replaces it with two mono tracks... rather surprising this doesn't seem to exist (it's one mouse click in ProTools [ducking])...
-James

Convert audio from mono to stereo

I have imported video and audio from a camera with microphone, and the audio is only playing out of the left speaker. This is despite the fact that both A1 and A2 channels in the timeline appear to have audio. I'm new to this, and any help to get the audio to come out of both speakers would be great!

Oh, wait a minute, I thought you meant you only had one audio track, and wanted its sound to come out both speakers. But now that I read your question again, you say that you have an A1 and A2. In that case, I dunno why you should have one dead audio track, unless you've accidentally turned it off, muted it, over on the left, at the head of the track. Or, if the tracks are not linked, maybe you've accidentally pulled its volume line down to the bottom (that red line running down each audio track that determines the volume level).
If not, somebody else will have to solve that for you. Sorry.

How to convert MIDI to mono OR limit the spread across the speakers

I recorded a MIDI Piano piece for a song I'm working on and it is spread across both speakers, the lows in the left and the higher frequencies in the right, the middles in the middle. This is quite annoying for mixing, is there anyway I can limit this to a mono track or control how much it spreads across the speakers (ideally only where I want it to)?

Hi Glenn,
you are mixing apples with oranges!
The audio instrument track is MIDI not audio!
cheers
rob
Hi, Rob,
Yes, I realized that, but I still can't account for the little track meter registering something when I moved the Audio Instrument track over.
Then go save up for Logic-Pro!
Christian,
Are you saying that Pro lets you collapse stereo instrument tracks into mono instrument tracks?
Cheers,
Glenn
PS, think I've got it. Christian has the right idea. Go to 'Insert' choose Logic 'Helper,' choose 'Gain' and you will then be allowed to select 'mono.' I'm just playing around with a piano. In stereo, the bass is toward the left, the treble toward the right. Selecting 'mono' disables the stereo field of the instrument.
Hope that helps,
Cheers,
Glenn

Converting stereo to mono...how??

I have a file that has stereo audio, but only has audio in the right channel. I want to tell it to be mono. How can I do this in CS3?
TIA
Dean
PS..I posted this in the 2x and earlier forum accidentally ....sorry if you see both posts

See also:
FAQ:How do I create mono/stereo out of stereo/mono audio?
Cheers
Eddie
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Captured stereo convert into Dual Mono

Hi all,
Some of the footage I have to work with is captured as DV with stereo audio tracks.
That's not so nice, because the audio is actual 2 mono channels (2 different mics on interviews)
I know I can switch off the stereo pair in the timeline. But that's tedious. I need to alter everyclip everytime I drop it in the timeline. Also I cannot Unpair the clip in the viewer, while I do need that because I want to lower the level of only one channel during chosing the quotes (because of wind in 1 mic for instance).
So it would be nice to be able to alter the master clips in the browser from stereopair to dual mono.
But I canot figure out how. Can this be done in FCP?
Can this be done in Quicktime.
Any ideas.
thanks
Rienk
NB (I know how to set up dual mono in Log and Capture. It's just that 10 tapes, that someone else did capture in stereo, and I need to work with)

UODATE:
Just opened one of the good clips (captured as DUAL Mono) in Quicktime. Then I see 2 seperate soundtracks. Sondtrack 1 with one ch1 set to MONO and Soundtrack 2 with one ch1 also set to MONO. It that way it differs from the two channels in the one Soundtrack 1 in the clips that were captured as Stereo.
Export the original masterclip from FCP with Export using QT conversion. and set it to export 2 discrete channels will indeed create a file with 2 Mono cannels. And they import as such. "2 Mono" it says.
Reconnecting the master clip to the newly created Dual Mono clip let FCP still think this is a stereoclip (As Andy pointed out, this is indeed not working)
Reconnecting the sequence clips to the newly created Dual Mono clip seems to work. But when I do match frame, then there comes again a stereo-version of the clip in my viewer. (also of course this is because it is looking to the original masterclip that we cannot change in FCP, as we saw in the previous sentence).
So I found a way to create new Dual Mono masterclips, but still I'm not able to alter the originals to the sequence clips.
The building will close here. So have to leave.
But I will try if I can change the settings of the masterclips from within an XML...
OR the solution would be in QT to split the two channels in two soundtracks in Quicktime... But how?
Rienk
Message was edited by: Rienk

Converting sound to mono

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