[Octave-bug-tracker] [bug #54668] unable to open audio recording stream

[Mike Miller]

Follow-up Comment #3, bug #54668 (project octave):

Have you tried Audacity on this system? If not, can you try installing and
testing it with the PortAudio interface? Does recording work correctly with
the Audiobox?

If you change your script so that the host is only recording and not trying to
play back simultaneously, does that increase the chance of success at all?

To answer the questions that I can,

> I don't know if this is being passed up from PortAudio or if it is coming
from Octave.

The error message comes from Octave, but it is in direct response to the
PortAudio function for opening an audio stream failing. So the question goes
back to why is PortAudio returning failure to open a stream on this particular
hardware with these particular settings?

> I also don't know what version of PortAudio is in Octave 4.4.1.

The Windows build of Octave is using the latest stable PortAudio release as
shown on http://www.portaudio.com/download.html, version 190600_20161030.

Just to give you an idea of what to expect from us, the Octave developers, we
have about 3 or 4 volunteers who have worked on the PortAudio interface over a
few years, all testing on GNU/Linux systems, and probably all with basic
onboard internal sound hardware. If the audio I/O functions work with
PortAudio on Windows, then great, that's why we decided to go with PortAudio.
But we are not audio device driver experts, nor are we PortAudio library
experts. And we have no extensive testing capabilities or hardware
compatibility requirements.

As the reporter of this bug with sole access to the specific hardware that
causes this bug, I think this bug has to rely on more information from you
helping to identify whether there is something specific in Octave's use of
PortAudio that needs to be changed. Or perhaps that the use of PortAudio at
all is insufficient for this use case or this hardware, maybe by comparing
other programs you have access to, such as Audacity, that use PortAudio on
Windows.

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