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Time stretching

From: Music Editing for TV and Film in Pro Tools

Video: Time stretching

If you are cutting temp music, you may often want to time-stretch or time- compress a piece of music to make it meet the needs of your cue a little better. Sometimes a music may just be the perfect tone, but maybe just a hair too fast or a hair too slow to score the scene. In this example, you don't need special edit rights because with a temp track you are really just creating reference audio that will be used internally within the production to convey the type of music that you will be replacing with a new score or new licensed music later on in the process.

Time stretching

If you are cutting temp music, you may often want to time-stretch or time- compress a piece of music to make it meet the needs of your cue a little better. Sometimes a music may just be the perfect tone, but maybe just a hair too fast or a hair too slow to score the scene. In this example, you don't need special edit rights because with a temp track you are really just creating reference audio that will be used internally within the production to convey the type of music that you will be replacing with a new score or new licensed music later on in the process.

One example of a time where you will need edit rights to compress or expand a track is in perhaps a dance or a club scene. Now imagine you have people dancing onscreen to a specific tempo. Perhaps the song used when the scene was shot was exactly at 121 beats per minute. If the song you're cutting with is at 119 beats per minute, it's going to be just a hair too slow and it won't stay in sync with the dancing throughout the scene. So in a case like this, you could very accurately time-compress the song to make it play at 121 beats per minute, instead of 119 beats per minute.

And again, in a case like this, you will need edit rights since you're altering the original intent of the composition. Now let's look at a couple of ways in Pro Tools to time-compress or expand. The first way is using the Time Compression and Expansion, or TCE, trim tool. You can access this by pressing the F6 key repeatedly until you see a small clock icon over the Trim tool, or by pressing Command+2 or Ctrl+2. And once you have the TCE trimmer selected, you can either click near the beginning or the end of a file and simply click and drag shorter or longer to compress or expand the file.

And when you release, a new file will be created that compresses or expands the file. Now another thing to note: you can also use the TCE trim tool within the Smart tool, which is a very handy function. Let's undo that and look at another way that we can compress or expand with a little more accuracy. Let's go up to the AudioSuite menu, under the Pitch Shift submenu, and choose Time Shift. You may have other third-party plug- ins that allow time compression or expansion, but for now we are going to use Time Shift in Pro Tools.

So using our example before, we can enter our start tempo of 119 beats per minute and press Return to set it, and enter our desired end tempo of 121 beats per minute, and again, press Return to set it. And when you press the Process button, a new file will be created that changes the tempo of this song from its original tempo to the new tempo. Using the Time Shift plug-in you also have more custom controls to refine your compression or expansion.

You can change the speed, you can change your end or length times, and you can even pitch-shift, or transpose, the key of the song.

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This video is part of

Image for Music Editing for TV and Film in Pro Tools
Music Editing for TV and Film in Pro Tools

35 video lessons · 3153 viewers

Skye Lewin
Author

 
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  1. 2m 49s
    1. Welcome
      52s
    2. Using the exercise files
      1m 32s
    3. A word about the film and music used in this course
      25s
  2. 25m 4s
    1. Creating a template session for working to picture
      7m 29s
    2. Importing a picture file
      3m 17s
    3. What is time code?
      4m 17s
    4. Syncing picture to Pro Tools
      6m 58s
    5. Importing audio files
      3m 3s
  3. 48m 36s
    1. Using the Zoom and View commands
      9m 54s
    2. Utilizing the edit modes
      7m 59s
    3. Navigating with key commands
      7m 57s
    4. Creating and using sync points
      3m 20s
    5. Using the snap editing commands
      5m 16s
    6. Using memory locations
      8m 12s
    7. Customizing crossfades
      5m 58s
  4. 1h 11m
    1. Auditioning music to picture
      10m 21s
    2. Editing to acquire multiple sync points within the same "cue"
      6m 2s
    3. Editing to maintain or change the arc/build of the cue to fit the scene
      15m 11s
    4. Editing the start and end of the cue
      9m 55s
    5. Setting up for a 30-second condensed edit
      4m 5s
    6. First pass of a 30-second condensed edit
      11m 17s
    7. Improving the 30-second condensed edit
      14m 41s
  5. 26m 49s
    1. Exploring alternate edits of the same song
      8m 17s
    2. Editing different songs to the same scene
      18m 32s
  6. 11m 25s
    1. Mixing the edit
      5m 26s
    2. Bouncing down the edit
      2m 47s
    3. Compressing the QuickTime files
      3m 12s
  7. 12m 19s
    1. Conforming the edit to picture if the scene has shifted
      5m 27s
    2. Conforming the edit if a shot's length changes within the scene
      6m 52s
  8. 10m 34s
    1. Removing profanities by reversing audio
      2m 8s
    2. Removing profanities with instrumentals
      2m 36s
    3. Keeping a song in sequence
      1m 19s
    4. Layering audio
      1m 36s
    5. Time stretching
      2m 55s
  9. 38s
    1. Goodbye
      38s

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