http://help.thefoundry.co.uk/nuke/8.0/content/user_guide/audio_in_nuke/audio_nuke.html
In many compositing projects it’s vital to be able to key visual changes to cues on the audio track that goes with the picture. You can use Nuke’s AudioRead node to read in an audio file, view it in the Curve Editor and Dope Sheet in order to line up keyframes of your composition with the waveform of the sound. You can then flipbook the audio with your footage to preview your comp with sound.
Quick Start
You can load audio files into Nuke using the AudioRead node, in much the same way as you read in images with the Read node. You can read in uncompressed WAV and AIFF files and flipbook them with your footage for playback.
Here's a quick overview of the workflow:
1. Read in an audio file.
2. Display an audio waveform for your audio clip and access its animation curve in the Curve Editor or the Dope Sheet.
3. When you’re done, you can flipbook your script to view and listen to the results.
Reading In Audio Files
To use the AudioRead node to read in an audio file:
1. To create an AudioRead node, click Other > AudioRead in the Nuke Toolbar.
The AudioRead node doesn’t have to be connected to other nodes.
Simple AudioRead node setup.
TIP: You can also load an audio file by creating an normal Read node and navigating to a supported audio file.
2. In the AudioRead properties, use the file control to navigate to the audio file you want to read in. You can read in uncompressed WAV and AIFF files.
3. Use the time range fields to enter the start and end times in seconds for the audio in Nuke.
4. In the file time range fields, enter the start and end times in seconds of the audio file read in. These are automatically set to the values in the file, but you can change them to trim the data used in Nuke.
5. If you want to discard your changes and reload the audio file, click reload.
6. Use the ratesource menu to select the source for the sample rate:
• file - reads the rate from the audio file.
• custom - lets you specify a custom sample rate in the rate field.
Creating and Editing Audio Curves
Once you have read in an audio file (see Reading In Audio Files), you can display an audio waveform for your audio clip and access its animation curve in the Curve Editor or the Dope Sheet.
Creating a Keyframe Curve
In the curves section of the AudioRead properties panel, you can generate curves out of the audio data:
1. Set the keyframe interval you want to use when creating the curves in the key interval field. For example, if you enter 3, keyframes are created to every third frame of the input footage.
2. Click generate to generate the audio data as a curve that you can use in the Curve Editor and Dope Sheet.
3. View the left and right stereo levels on the current frame in the left and right fields and adjust if necessary. Any changes are reflected on the curve automatically.
Modifying the Audio Curve in the Curve Editor and Dope Sheet
When you’re working with your audio curve in the Curve Editor or Dope Sheet, there are a few right-click options that you can use to adjust how the clip’s waveform displays:
1. Right-click in the Curve Editor or Dope Sheet and select View > Audio.
2. Then select Source and check the box for either ProjectDefault or an AudioRead node depending on which one you want to view. If you’ve only got one AudioRead, it is the project default.
3. If you’re working with a stereo clip with more than one audio channel, you can select your audio channel by ticking the appropriate box under Channel.
4. Select a style in which you want your waveform to be drawn by selecting one of the DrawStyle options:
• Off - to draw no audio waveform.
• Behind - to draw a waveform behind the animation curves.
• Below - to draw a waveform below the animation curves.
Flipbooking the Audio Track
When you’re done, you can proceed to flipbooking your results:
1. Click the flipbook this Viewer button in the Viewer timeline.
2. In the Flipbook dialog, select the AudioRead file you want to use in the Audio dropdown.
3. Click OK. View and listen to your clip in FrameCycler.
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