Recipe: Making a livecoding screencast with QuickTime and RecordIt
This post shows how to make a livecoding screencast using free OSX technologies.
Capturing system audio and screen-recording your live coding performance can be done in multiple ways. Here's a method based on Apple's Quicktime and an audio plugin that is part of a third-party software, Record It.
Note: both of these software components are free. The Record It Audio Device which is a free extension that enables you to capture system sounds on your Mac. It acts as a virtual audio input device and sends the sound from music, videos, and system alerts that you would normally hear through your speakers to the input cha
Recording a screencast: steps
- Get the Record It audio plugin PS this is a free audio extension, even if it is part of a paid-for software (RecordItAudioDevice.pkg)
- Install it by right-clicking on app and selecting 'Open...' to avoid the permissions issue
- On AudioMidi Setup, Create an Aggregate Device to combine multiple audio interfaces
- Increase sample rate to 96hz, if necessary
- Open Quicktime and set it to record your screen, making sure you get audio from the RecordIt audio plugin
- Set your DAW (eg Ableton Live) to output audio to RecordIt
- Set your computer to output sound to the Aggregate Device (so that you can also hear what's going on e.g. if you are using headsets)
DONE!
Post-processing tips
Often the audio I get from a Quicktime screencast recording is rather weak.
I found an easy way to fix that by using iMovie, which normally comes with any Mac. Here are the steps:
- Open the livecoding screencast in iMovie
- Detach Audio (right-click on movie bar to see the options menu)
- Adjust the volume in the audio track editor, by dragging the mouse up/down (avoid red zones!)
- Additionally, you can try using the top left menu:
Music Settings > Equalizer > Music Enhance
- Additionally, you can try using the top left menu:
- Save the new movie:
Share > File- Resolution: 720p 60
- Quality: High
- Compress: Faster
Results: For a 10 mins video, that gives me a .mp4 file of ~250M
Upload to YouTube and off you go ;-)
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See also:
2021
2020
2017
paper Data integration and disintegration: Managing Springer Nature SciGraph with SHACL and OWL
Industry Track, International Semantic Web Conference (ISWC-17), Vienna, Austria, Oct 2017.
paper Fitting Personal Interpretation with the Semantic Web: lessons learned from Pliny
Digital Humanities Quarterly, Jan 2017. Volume 11 Number 1
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paper Fitting Personal Interpretations with the Semantic Web
Digital Humanities 2013, University of Nebraska–Lincoln, Jul 2013.
2012
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2007
paper PhiloSURFical: browse Wittgensteinʼs Tractatus with the Semantic Web
Wittgenstein and the Philosophy of Information - Proceedings of the 30th International Ludwig Wittgenstein Symposium, Kirchberg, Austria, Aug 2007. pp. 319-335