Kazam only outputing recordings in mono

[Gavin van Lelyveld]

I've tried a few versions of kazam, including the bzr checkout with python3 setup.py install. Whichever codec I use the output audio is always mono.

Hardware-wise I'm running a laptop with it's internal audio, and a USB headset.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: kazam 1.4.3-0ubuntu1 [origin: LP-PPA-kazam-team-stable-series]
Uname: Linux 3.6.3-030603-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
CrashDB: {"impl": "launchpad", "project": "kazam"}
Date: Sat May 11 23:01:03 2013
InstallationDate: Installed on 2012-12-08 (154 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: kazam
UpgradeStatus: No upgrade log present (probably fresh install)

[Gavin van Lelyveld (mdcore+launchpad)]

I opened kazam with the --debug parameter, selected a window and recorded for a few seconds. This is the output.

[Gavin van Lelyveld (mdcore+launchpad)]

I get the same results even if I remove the USB headset and only choose the internal sound card.

[Arnau (ninjastyleftw)]

I'm having the same issue, could this problem make bad sound recording? becuase if I record microphone and speakers at the same time I'm getting no speakers recording but duplicated microphone recording :S Or should I open a new bug?

[Gavin van Lelyveld (mdcore+launchpad)]

@Arnau I think your issue is different. I get both game and microphone audio. My problem is that the resulting rendered file has mono sound. I think you'll need to open a new bug.

[Romain Bar (romainbeha-r)]

The GStreamer audio source are mono by default (one channel, must set 2).
Updating the two following lines in file 'gstreamer.py' fixes that:

 self.aud_caps = Gst.caps_from_string("audio/x-raw")
 self.aud2_caps = Gst.caps_from_string("audio/x-raw")

to replace with:

 self.aud_caps = Gst.caps_from_string("audio/x-raw,channels=2")
 self.aud2_caps = Gst.caps_from_string("audio/x-raw,channels=2")

[David Klasinc (bigwhale)]

I'll look into this. It might be true that GStreamer needs channels to be specified. However, this will have to be done with a little more care, because not all sources have two channels. Some more PulseAudio code will be needed to detect number of channels for specified devices.

Thanks for noticing this.

[Dan Johansen (strit)]

So, when is this fix being released to the masses? It is fairly annoying to only be able to record audio in mono. :P

[Dan Johansen (strit)]

@Romain Bar
Where is that file located? I've searched everywhere and I can't find it.

[Dan Johansen (strit)]

Nevermind, I found it in /usr/lib/python3.4/site-packages/kazam/backend/gstreamer.py.
Edited the lines and now it works. :)

[Srikant Patnaik (u-srikant-patnaik)]

The unstable repository doesn't have the stereo issue fixed.
I had to manually add Romain's fix :)

[ElTomoLoco (tomaspartl)]

@Romain Bar (romainbeha-r): Thanks for the fix, man!!