Description of problem: I would like to have a complete capture of my GNOME session, including both the images displayed on my screen and the sound played by my speakers. recordmydesktop does the job well as far as video capture is concerned, but audio capture does not work as I wish. I would like recordmydesktop to capture the sound from the PCM channel, but it currently captures from the microphone(s) only. Version-Release number of selected component (if applicable): http://www.alsa-project.org/db/?f=e0516aa374b4fb12e42351e219a2cbf1ebd09c86 F11 rawhide updated as of 2009-05-22. Here are the versions of a few packages I estimate as relevant: kernel-2.6.29.3-155.fc11.x86_64 alsa-lib-1.0.20-1.fc11.x86_64 alsa-utils-1.0.20-3.fc11.x86_64 pulseaudio-0.9.15-11.fc11.x86_64 alsa-plugins-pulseaudio-1.0.18-3.fc11.x86_64 gstreamer-0.10.22-3.fc11.x86_64 gtk-recordmydesktop-0.3.8-1.fc11.noarch recordmydesktop-0.3.8.1-1.fc11.x86_64 gnome-media-2.26.0-6.fc11.x86_64 gst-mixer-2.26.0-2.fc11.x86_64 How reproducible: always Steps to Reproduce: 1. run rgtk-recordMyDesktop 2. start recording with sound 3. try again after changing settings in alsamixer -c0 Actual results: Sound capture always goes through the active microphone (be it the notebook's internal microphone or a plugged-in external microphone). There is no way to capture the PCM channel directly. alsamixer -c0 does not offer a "CAPTUR" switch on the PCM channel. Expected results: Possibility to capture audio from directly the PCM channel and not from the active microphone. Additional info: The notebook is a Lenovo Thinkpad W500. If I run alsamixer -c0, I see the following information: Card: HDA Intel Chip: Conexant CX20561 (Hermosa) The following things are quite puzzling to me: * the channels for the three microphones (internal, external, docking) appear under "Playback" but not under "Capture" * none of the channels (including PCM) has a "capture" switch If I run alsamixer without the -c0 option, I get only Card: PulseAudio Chip: PulseAudio with a single "Master" playback channel and a single (switchable) "Capture" channel. I suspect the source of the problem lies within alsa, but it could also be pulseaudio, or even gstreamer? I also wonder if bug 487794 is related, since it is about a Conexant cx20561 (Hermosa) codec. I am not affected by that bug, though.
Since there was no reaction so far, I wonder if I have filed the bug under the correct component. Should it be reassigned to alsa-lib, gnome-media, gstreamer, pulseaudio?
The hardware does not support requested feature (unless you turn on analog loopback which is also not supported on all codecs - see 'amixer controls'). You can obtain playback PCM stream using tee plugin (alsa-lib) or use snd-aloop kernel driver. Regarding PA - I don't know if it's possible to capture playback stream in PA.
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle. Changing version to '11'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Thanks for your reply. It looks like there is no 'Analog Loopback' mixer control with my codec, as 'amixer controls' returns numid=4,iface=MIXER,name='Master Playback Switch' numid=3,iface=MIXER,name='Master Playback Volume' numid=2,iface=MIXER,name='Capture Switch' numid=1,iface=MIXER,name='Capture Volume' So I have to try the other two options. Could you point me to some documentation about the ALSA tee plugin? And... Could you please confirm that snd-aloop is not packaged for Fedora? If this is the case, I will mark this bug as a duplicate of bug 496200.
alsa-lib example (the string after -D is device name for alsa-lib): aplay -D tee:SLAVE=\"plughw:0\",FILE=/tmp/abcd.raw <some_wav_file> And yes, snd-aloop is not in mainstream or Fedora kernels. *** This bug has been marked as a duplicate of bug 496200 ***
I think that snd-aloop is not in the kernel because of pulse-audio.. I installed pavucontrol. pulseaudio volume control launch pavcontrol, select input devices. select the drop down menu at the bottom right and select 'all input devices' then you will see 'monitor of <your sound card>' my was SB Audigy so I selected that. then I used pulse to record in recordmydesktop and It worked I had sound. that is if you want to record sound from your desktop and not from your microphone, if you want your microphone select the device that is your microphone.