Cameras and audio streams will use the async output routines, but
not screencasting. This needs to be handled differently in the
processing callback.
As it is, the code is starting to get a bit messy, as we're now
dealing with two different frame processing approaches. Later on,
this code will be cleaned up and split in more logical pieces.
Co-authored-by: Georges Basile Stavracas Neto
<georges.stavracas@gmail.com>
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