Editing 2012 OLF audio

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This page is to coordinate activities for editing the audio files from the 2012 Ohio LinuxFest.  It is divided into a section for each SD card, which contains a number of talks.  To claim a particular talk or set of talks, download the raw audio file from the linked directory and then change the entry in the "Editor" column from "unclaimed" to your name/e-mail address.  If it takes you more than a few days to work on them, e-mail [[User:Vance|Vance]], otherwise he may revert it back to "unclaimed" so someone else can pick it up.
 
This page is to coordinate activities for editing the audio files from the 2012 Ohio LinuxFest.  It is divided into a section for each SD card, which contains a number of talks.  To claim a particular talk or set of talks, download the raw audio file from the linked directory and then change the entry in the "Editor" column from "unclaimed" to your name/e-mail address.  If it takes you more than a few days to work on them, e-mail [[User:Vance|Vance]], otherwise he may revert it back to "unclaimed" so someone else can pick it up.
  
Contact [[User:Vance|Vance]] for instructions and credentials for uploading the edited files.
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More [[#Editing_Instructions|specific instructions on editing]] will appear at the end of this page.  When you're done, name the resulting WAV file as ##.wav with the track number from the table.  Compress the WAV files as FLACs (this saves upload time and storage space) and upload them to INSERT LOCATION.
 
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More [[#Editing_Instructions|specific instructions on editing]] appear at the end of this page.  When you're done, you should have a FLAC file named as ##.flac with the track number from the table.  Then upload to the location you were given.
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== Card 1 ==
 
== Card 1 ==
[http://pair.ohiolinux.org/rawaudio2012/card1/ Link to raw files]
 
  
 
=== Early Penguin Talks ===
 
=== Early Penguin Talks ===
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== Card 2 ==
 
== Card 2 ==
[http://pair.ohiolinux.org/rawaudio2012/card2/ Link to raw files]
 
  
 
=== Track 2 Talks ===
 
=== Track 2 Talks ===
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== Card 5 ==
 
== Card 5 ==
[http://pair.ohiolinux.org/rawaudio2012/card5/ Link to raw files]
 
  
 
=== Track 4 Talks ===
 
=== Track 4 Talks ===
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== Card 6 ==
 
== Card 6 ==
[http://pair.ohiolinux.org/rawaudio2012/card6/ Link to raw files]
 
  
 
=== Opening Keynote Talk ===
 
=== Opening Keynote Talk ===
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== Card 7 ==
 
== Card 7 ==
[http://pair.ohiolinux.org/rawaudio2012/card7/ Link to raw files]
 
  
 
=== Open Source Solutions Stage Talks ===
 
=== Open Source Solutions Stage Talks ===
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== Card 9 ==
 
== Card 9 ==
[http://pair.ohiolinux.org/rawaudio2012/card9/ Link to raw files]
 
  
 
=== Career Track Talks ===
 
=== Career Track Talks ===
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|-
 
|-
 
|61
 
|61
|The American Dream: Seven Steps to (Career) Ownership
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|Career Ownership
 
|Janine Moon
 
|Janine Moon
 
|SR000F.flac / SR000R.flac
 
|SR000F.flac / SR000R.flac
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|63
 
|63
 
|2CheckOut
 
|2CheckOut
|Alan Czako
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|Alan ?
 
|SR000F.flac / SR000R.flac
 
|SR000F.flac / SR000R.flac
 
|unclaimed
 
|unclaimed
 
|-
 
|-
 
|64
 
|64
|The Perspective of Recruiters
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|Direct Hire Recruitment
 
|Lou Russo and Rufus Smith
 
|Lou Russo and Rufus Smith
 
|SR001F.flac / SR001R.flac
 
|SR001F.flac / SR001R.flac
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=== Selecting audio channel ===
 
=== Selecting audio channel ===
  
From the drop-down track menu (the downward-pointing triangle at the upper left of the track), select '''Split Stereo to Mono''' for each track.  Now your job is to choose which of these sounds the best.  You can isolate tracks using the '''Mute''' and '''Solo''' buttons on each track.
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From the drop-down track menu (the downward-pointing triangle at the upper left of the track), select '''Split Stereo to Mono''' for each track.  Now your job is to choose which of these sounds the best.
  
If you're working on a STE-###.flac file, there should really be no difference.  If you find that one has more noise or lower signal, then delete that track by clicking the X in the upper left; otherwise, pick one at random to delete.
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If you're working on a STE-###.flac file, there should really be no difference.  If you find that one has more noise or lower signal, then delete that track by clicking the X in the upper left.
  
 
For the SR###F.flac / SR###R.flac files, you'll probably find that one of the channels is louder than the others.  Pick whichever one seems to have the best signal to noise ratio, then delete the rest using the X in the upper left.
 
For the SR###F.flac / SR###R.flac files, you'll probably find that one of the channels is louder than the others.  Pick whichever one seems to have the best signal to noise ratio, then delete the rest using the X in the upper left.
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=== Normalizing ===
 
=== Normalizing ===
  
At this point you'll have just one single mono track left.  Make sure you do not have a selection made, or alternatively select the entire track.  Now you'll want to change the display to '''Waveform (dB)''' using the drop-down track menu (the triangle in the upper left of the track).  You can zoom in by left-clicking on the scale or zoom out by right-clicking.
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At this point you'll have just one single mono track left.  '''Effect -> Compressor'''  ADD DETAILS
 
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[[Image:Olfcompressor1.jpg]]
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You should see something like the above (minus the red and green lines).  The red line represents the noise floor: that is, the amount of sound present when no one is talking.  For STE-###.flac files, you can probably just set this to -60 dB and not worry about it, since noise shouldn't be a problem there.  For the SR###F/R.flac files, you'll have to listen and pick a reasonable value (take note that this can only be adjusted in 5 dB steps).  Here we've chosen -55 dB.
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The green line indicates the threshold value.  This is the point at which the effect starts to tamp down the louder peaks so that the entire track has a more consistent volume level.  Set this around the level of the most quiet parts of the speech.  Here we're using -50 dB.  Try not to set this too close to the noise floor; a 5 dB difference is probably as close as you want to be.
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Now we select '''Effect -> Compressor''' from the menu and get a dialog like the below.
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[[Image:Olfcompressor2.jpg]]
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As discussed, we have set the threshold at -50 dB and the noise floor at -55 dB. Those two settings are the only ones that need to be changed from one speech to another.  Make the ratio 10:1, attack time 0.1 secs, and decay time 1.0 secs.  Check the box for '''Make-up gain''', and uncheck the one for '''Compress based on Peaks'''.  Then click '''OK''' and wait a few minutes for it to work its magic.
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[[Image:Olfcompressor3.jpg]]
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When complete, you should get something like the above.  The times where the speaker is talking should be no lower than -15 dB, and preferably -12 dB or greater.  This example is quite noisy, so you don't see as much differentiation between periods of speech and periods of silence.  Take a listen and if you're not happy, hit '''Edit -> Undo''' and try again with different settings.
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=== Saving ===
 
=== Saving ===
  
Once you're happy with the way things sound, go to '''File -> Export'''.  You can select "WAV signed 16 bit PCM" as the format, or if it's supported choose "FLAC" from within Audacity (make sure under "Options" you choose 16 bit).  Name the file with the track number (e.g., 07.wav or 07.flac).  WAV files can be compressed after the fact using the command line '''flac --best ##.wav''' which will create a file named ##.flac.
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Once you're happy with the way things sound, go to '''File -> Export'''.  You can select "WAV signed 16 bit PCM" as the format and compress to FLAC in a separate step, or if it's supported choose "FLAC" from within Audacity (make sure under "Options" you choose 16 bit).  Name the file with the track number (e.g., 07.wav or 07.flac).

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