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Using AVFoundation/QTKit how would you record multiple video devices at same time to a file/files?

I know how to record them separately but trying to record both at once causes errors like...

"cannot be added to the session because the source and destination media types are incompatible."

Thanks in advance

Equinox2000
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  • FWIW I'm not sure that you can write to the same file from two output devices at once. Even if you could it would be a mess. They will have to record in separate files. On that note, are you trying to record both front and back camera at the same time? – anon_dev1234 Mar 02 '13 at 19:26
  • Currently I'm trying to record desktop and a webcam at same time. Sort of how screenflow does it (and they do it to one file). Im guessing they somehow attach the inputs to a custom output data writer. – Equinox2000 Mar 03 '13 at 21:27

1 Answers1

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Here is an article explaining how you can do it:

Capturing from multiple devices with QTKit

Jørn Schou-Rode
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THE APPATAKKAR
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  • Whilst this may theoretically answer the question, we would like you to include the essential parts of the linked article in your answer, and provide the [link for reference](http://meta.stackexchange.com/q/8259). Failing to do that leaves the answer at risk from link rot. – Kev Mar 06 '13 at 11:37
  • Unfortunately the example is based around viewing the multiple devices rather than recording to a actual file/files which is part of my requirement. – Equinox2000 Mar 06 '13 at 17:23