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I'd like to make a screencast that records both mic (audio input) and system sounds (audio output) at the same time. For example, so that I can capture a screencast while talking to someone on Skype and capture both sides of the conversation. How can I do this? (I'm using Natty if it matters.)

So far I have tried Kazam, RecordMyDesktop and Tibesti. (Tibesti explicitly has this feature but it doesn't seem to work. Kazam has existing enhancement requests for this feature.)

Please provide complete instructions/options, like those given for running RecordMyDesktop from the command line in this generic screencasting answer.

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They all record the mic fine, so if there is some hack to pipe audio out into the mic input, that would be acceptable as a temporary workaround, and I will hope that whoever calls likes the sound of their own voice. – d3vid Aug 17 '11 at 11:50
Another workaround would be a separate app that recorded system sounds that I could then splice into the screencast? – d3vid Aug 17 '11 at 12:06
up vote 3 down vote accepted

Look for a way to combine sound channels instead of looking for multirecording screencast app. A method similar to the one described here may work: (that's for PulseAudio, IIRC there are also similar in spirit tricks for JACK)

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thanks, this is exactly what I needed - this tutorial seems to be based on… which describes more of the technical detail for those who are interested – d3vid Oct 17 '11 at 5:38

Hope this is what you are looking for:

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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Stefano Palazzo Aug 25 '11 at 13:05
Alright. I'll keep that in mind next time around. – rigved Sep 1 '11 at 13:01
@rigved I do not get the same options as the screencaster, could it be a hardware capability issue, or do I need to pick a specific sound profile? see… (created a separate question for the more specific issue) – d3vid Oct 12 '11 at 6:02

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