24 Replies Latest reply: Jul 4, 2011 7:20 AM by RJRadio RSS

    Splitting Stereo Channels into seperate tracks

    Community Member
      I have a stereo audio track which I have pulled from an AVI file in prem pro. The left channel has voice from a radio mic while the right channel is the camera mic with general audio. I need to seperate the two channels so I can use the voice audio when its needed.

      So my question is how do u do this?

      I'm a beginner user of AA though I have owned veris versions for some years, just never had the time to get right into it until now. I've have spent the last couple of days digging through help menus and manuals trying to solve this problem. Usually I'd use hardware to do a work around but I figured I might as well start using the software.

      Any help would be appreciated...
      Sorry if this is a silly noob question.
        • 1. Re: Splitting Stereo Channels into seperate tracks
          SteveG(AudioMasters) Community Member
          Probably the easiest and simplest way is to use keystrokes, although you are going to have to save a pair of mono files during the process, which involves a 'save as'.

          So, in EV:
          Ctrl-A (selects entire file)
          Ctrl-L (selects LH channel)
          Edit>Copy to new (no keystroke for this, but you could assign one if you needed to)
          File>Save As

          Then go back to your original file (which we are not destroying, incidentally - good practice) using the Window menu (it will be selectable at the bottom of the list), and repeat the process above, only this time using Ctrl-R instead of Ctrl-L.

          I'm sure that there are other ways of doing this as well - I can think of at least one using MV, but if you want to keep process files, the above method is probably the best one to use.
          • 2. Re: Splitting Stereo Channels into seperate tracks
            ryclark Community Member
            Or you can use the Convert Sample Type (F11) to split out the audio into separate files. Or the Channel Mixer effect. But remember to do a Save As to keep the original file and have separate newly named ones for the split files.
            • 3. Re: Splitting Stereo Channels into seperate tracks
              SteveG(AudioMasters) Community Member
              >Or you can use the Convert Sample Type (F11) to split out the audio into separate files.

              Hmm... you have to have a separate copy of the stereo file in the first place for this to work. If you set Convert Sample Type to change your file to 100% left, it will promptly get rid of 100% right for you!

              And using the channel mixer will run you into the same problem - you need at least two copies of your file to start with.

              I still think that all things considered, my original approach is the one to go for, simply because it creates what you need without you having to do a load of extra work in the first place.
              • 4. Re: Splitting Stereo Channels into seperate tracks
                ryclark Community Member
                Not necessarily. Surely after you have saved it you just do an Undo and have your stereo file back to split out the other half from.
                • 5. Re: Splitting Stereo Channels into seperate tracks
                  SteveG(AudioMasters) Community Member
                  >Not necessarily. Surely after you have saved it you just do an Undo and have your stereo file back to split out the other half from.

                  Don't like that! I do have another suggestion though - and that's to do the Ctrl-A Ctrl-L bit, and then go Edit>Copy to New. Then, go back to the original waveform by clicking on it in the files list, and go Ctrl-R and do Copy to New again.

                  That leaves your original, gives you two mono files to save and doesn't invoke Undo - which I've always regarded as something of a cop-out in this sort of process.

                  What's most annoying is that the process I described doesn't seem at first glance to be amenable to being scripted... it's failed at every attempt so far, because the concept of 'to New' doesn't appear to be supported in scripting at all, unless I'm missing something.
                  • 6. Re: Splitting Stereo Channels into seperate tracks
                    Community Member
                    Thanks for the info...I'll give your suggestions a whirl.

                    I sat down last night and had a rethink on the problem, the method I managed to work out with what I'd learned was to edit the left channel drag the field the entire length and delete it then covert the left over right channel to mono 50/50% left right. Then save it as say Radio Mic then went back to the original and repeated the process with the other channel.

                    Seemed to work alright...the voice track is now clean and clear.

                    So my original question was me wondering if there was a way to do this more simply. But I'll have another read of your replies and give them a try. Since there is more than one way to skin a cat...

                    Cheers
                    • 7. Re: Splitting Stereo Channels into seperate tracks
                      SteveG(AudioMasters) Community Member
                      >I sat down last night and had a rethink on the problem, the method I managed to work out with what I'd learned was to edit the left channel drag the field the entire length and delete it then covert the left over right channel to mono 50/50% left right. Then save it as say Radio Mic then went back to the original and repeated the process with the other channel.

                      Ooh that sounds painful... the shortcuts are well worth it, especially if the file is large - and I think that I've saved you having to make any more copies of the original file at all!
                      • 8. Re: Splitting Stereo Channels into seperate tracks
                        Ozpeter Community Member
                        > The left channel has voice from a radio mic while the right channel is the camera mic with general audio. I need to seperate the two channels so I can use the voice audio when its needed.

                        I would have thought the way to do this is to use multitrack view.

                        Put the file on track one and on track two.

                        Use the "channel mixer" effect on track one and set it so that the left and right outputs are sourced from the left input. Use the same effect on track two and set it so that the left and right outputs are sourced from the right input. You now have the signal from each mic on a totally separate track.

                        Now use volume envelopes to bring the two sources in and out as required. Mix down when done, whole job done in one pass. (And you could pan the two tracks slightly apart left/right if you wanted).
                        • 9. Re: Splitting Stereo Channels into seperate tracks
                          SteveG(AudioMasters) Community Member
                          >I would have thought the way to do this is to use multitrack view.

                          In principle I agree, but there's something about the way the original is worded that made me think that perhaps this wasn't the answer - I very much got the impression that the OP wanted to do the editing with separate files in PP, rather than sweetening in Audition. Maybe just me, though...
                          • 10. Re: Splitting Stereo Channels into seperate tracks
                            Ozpeter Community Member
                            He might not be that familiar with this way of working but it sure would be a good project to learn on (depending on degree of urgency of course)!
                            • 11. Re: Splitting Stereo Channels into seperate tracks
                              Community Member
                              In the thread shown below, in the entry dated 18th July 2007 I posted a link to a program I created to perform this task.

                              http://www.audiomastersforum.net/amforum/index.php/topic,6374

                              I've had very little feedback about this, but it works for me.

                              Note:

                              I don't know if the version posted is the latest version (the first version I posted may have had a problem, can't remember).

                              I am currently in Scotland and won't return home to Australia until the end of November, so can't provide any help for several weeks.

                              Cheers,
                              Alan
                              • 12. Re: Splitting Stereo Channels into seperate tracks
                                Matt Petersen Community Member
                                excellent Alan, I believe Adobe should give you a wad of cash (USD please...) and incorporate your functionality into Audition.

                                I know music people don't really "get" why you need to split stereo's, but people working in radio and (especially) film/video need to do it all the time and it's quite frustrating to not have a clear & simple workflow in AA3.

                                matthew
                                • 13. Re: Splitting Stereo Channels into seperate tracks
                                  SteveG(AudioMasters) Community Member
                                  For reasons not yet ascertained, you can't download the zip file at present. Well, I can't here, anyway, because the download site password doesn't appear to work (and it certainly did before). I will contact the owner of it...
                                  • 14. Re: Splitting Stereo Channels into seperate tracks
                                    SteveG(AudioMasters) Community Member
                                    >I will contact the owner of it...

                                    I've now heard back from the server owner, and the server is now working again - it was moved to a new ISP and not reset, apparently.

                                    What's not so good is that Alan's folder doesn't appear to be there, so a little more remedial work is required, I think.
                                    • 15. Re: Splitting Stereo Channels into seperate tracks
                                      SteveG(AudioMasters) Community Member
                                      I got a message back from the site manager which says "If it isn't there, it wasn't on the FTP site when I switched hosts."

                                      So Alan, if you are presently able to, you need to put the file back!
                                      • 16. Re: Splitting Stereo Channels into seperate tracks
                                        Community Member
                                        OK, I've rummaged around this laptop & found the files. You'll now find them here:-

                                        http://www.bunyipmusic.com/s2m.zip

                                        stereo2mono.exe can be run from the command line, e.g.

                                        stereo2mono wavefile1.wav wavefile2.wav ...

                                        or you can drag several wave files to stereo2mono.exe (or a shortcut to the program). If you wish to use it this way, I have provided an icon.

                                        Either way windows will limit the number of files to 10 or so, depending mainly on the length of their names. Note that the program is not a DOS program, but must be run from the command line in windows (NT, XP etc.), although just to be confusing we sometimes call this DOS!

                                        Heading off into the unknown tomorrow, so internet access will be rather patchy.
                                        • 17. Re: Splitting Stereo Channels into seperate tracks
                                          SteveG(AudioMasters) Community Member
                                          That's great - I've renamed it to the way it was, and put it back in the archive. So the original link still works, and it's a simple matter of right-clicking on that and using Save As.
                                          • 18. Re: Splitting Stereo Channels into seperate tracks
                                            FCP User

                                            I realize this thread has gone dormant, but having begun putting Premiere Pro CS5 through some paces and needing to split a stereo audio track in order to treat each side differently, I wonder why not

                                             

                                            A) duplicate the stereo audio track and place the result in the next available audio channel, then

                                             

                                            B) pan track one all the way to either the L or R, followed by

                                             

                                            C) pan track two all the way opposite

                                             

                                             

                                            Voilá! Separate tracks for processing!

                                             

                                            However, the best and most obvious choice is an editing app that simply allows one to de-couple the stereo track in the first place -- like Final Cut Pro.

                                             

                                            ====

                                             

                                            That said, I am impressed with the speed at which PP works (aaaahhh, 64-bit app). Otherwise, underwhelmed by the relative paucity of functionality of the app compared with FCP.

                                            • 19. Re: Splitting Stereo Channels into seperate tracks
                                              ryclark Community Member

                                              Audition does this easily and always has done although not a video editing app and not available for Mac users except when used in a Windows emulation.

                                              • 20. Re: Splitting Stereo Channels into seperate tracks
                                                FCP User Community Member

                                                Good to know that Audition has that capability, although for we who edit, bouncing out to a second app simply for the purpose of being able to perform simple operations on accompanying audio is inefficient.

                                                 

                                                Having no interest in working with windows os nor emulating same, Audition is, for the foreseeable future, off the table for this correspondent. Perhaps down the road.

                                                 

                                                Happy editing!

                                                • 21. Re: Splitting Stereo Channels into seperate tracks
                                                  tjsCreative1 Community Member

                                                  Sorry to dredge up old stuff, but this concept of splitting out lav microphone from boom microphone just became an issue for me.  I'd also like to be able to clean up the audio.  The thread seems to be about Premiere Pro until the more recent posts.

                                                   

                                                  I use Premiere Pro CS5 right now.

                                                   

                                                  Seeing the conclusion of the thread, i downloaded Audition 5.5 to try it.  I quickly found i can't edit mxf files, my video source.

                                                   

                                                  Thus, i went back to the top of the thread to try the basic solutions.

                                                  So, in EV:
                                                  Ctrl-A (selects entire file)
                                                  Ctrl-L (selects LH channel)
                                                  Edit>Copy to new (no keystroke for this, but you could assign one if you needed to)
                                                  File>Save As

                                                   

                                                  What is EV?  I can't find any Adobe references to it.

                                                  • 22. Re: Splitting Stereo Channels into seperate tracks
                                                    therealdobro Community Member

                                                    (Mike_Good) wrote:

                                                     

                                                    I have a stereo audio track which I have pulled from an AVI file in prem pro. The left channel has voice from a radio mic while the right channel is the camera mic with general audio. I need to seperate the two channels so I can use the voice audio when its needed.

                                                    So my question is how do u do this?

                                                    I'm a beginner user of AA though I have owned veris versions for some years, just never had the time to get right into it until now. I've have spent the last couple of days digging through help menus and manuals trying to solve this problem. Usually I'd use hardware to do a work around but I figured I might as well start using the software.

                                                    Any help would be appreciated...
                                                    Sorry if this is a silly noob question.

                                                     

                                                    Load the stereo track into Waveform View.  Click the little L to the right of the upper half of the waveform and it will mute the left channel.  Click File>Save As and save the right channel.  Then unmute L and repeat the procedure with the little R to the right of the lower half of the waveform.

                                                     

                                                    This is faster than working in Multitrack, I think.

                                                    • 23. Re: Splitting Stereo Channels into seperate tracks
                                                      therealdobro Community Member

                                                      tjsCreative1 wrote:

                                                       

                                                       

                                                      What is EV?  I can't find any Adobe references to it.

                                                      EV is Edit View, which is what it was called in Audition 3 when this thread was started.  Now it's called Waveform View, and because it's a new program, Waveform View often does things a different way.  In the post above this one, I've described a method you can use in Waveform View in 5.5.

                                                      • 24. Re: Splitting Stereo Channels into seperate tracks
                                                        RJRadio Community Member

                                                        All the choices above  are great and the beauty of AA is there are many ways to do things.   I use another way for Lav Mics which is for me quicker.   Load the orginal file in Edit View.

                                                        Copy to New  (keeping the original safe) then on the new version first select all then  Control L the left channel with audio  the right is blank then copy followed by control R and then paste and save the new two channel lav file for further tweaking.

                                                         

                                                        Cheers