On Fri, 2012-11-09 at 03:02 +0100, Miroslav Rovis wrote: > Would there be any help from you guys in the issue that I haven't > solve and have trouble with for a week or so... To make sure that I have understood the problem correctly, I'll try to summarize it here: You have been happily capturing video and audio from a video capture card for some time now. The audio capture has been done by connecting the video capture card's audio output to a sound card's line-in using a physical loopback cable. The audio capturing has been done so far with direct alsa access without pulseaudio in the middle. This has been working fine, until recently it just stopped working. What are the symptoms of the breakage? Do you get silence instead of real audio, or does mencoder refuse to do anything at all? Do you get any error messages from mencoder? > Pls, so I don't have to explain all over, could someone take a gander at: > > http://lists.mplayerhq.hu/pipermail/mencoder-users/2012-November/013229.html > > Just to get you in the right mode (hopefully), I will copy a line or two: > > ... > My question is: > > how do I either: > > 1) configure mencoder to capture pulseaudio just like ffmpeg does While it would probably be better to figure out why capturing from alsa has suddenly stopped working, capturing from pulseaudio should be possible too. I'm looking at the mencoder man page at http://www.mplayerhq.hu/DOCS/man/en/mplayer.1.html Currently you seem to configure audio capturing using the "tv" option: tv=input=1:driver=v4l2:device=/dev/video0:normid=3:input=1:alsa=1:adevice=hw.0,2:audiorate=48000:amode=1:width=768:height=576 The audio specific parts are: alsa=1 (use alsa) adevice=hw.0,2 (use direct hardware access with device 2 of card 0) audiorate=48000 (audio sample rate) amode=1 (stereo) The documentation for the "tv" option doesn't say anything about pulseaudio, so direct support for pulseaudio in mencoder doesn't seem to exist. Pulseaudio can be accessed through the alsa interface, however. Most distributions configure the "default" alsa device to use pulseaudio. To check whether this is configured on your machine, you can do this: arecord -Ddefault > /dev/null That will make arecord capture from the alsa device named "default" and direct the output to /dev/null. While the command is running, open pavucontrol and see if the capture stream is visible in the "Recording" tab. The stream should be listed as "ALSA plug-in [aplay]: ALSA Capture". For reference, that string is generated by the alsa plugin that acts as the bridge between the alsa application and pulseaudio. It says "aplay" instead of "arecord", because arecord is actually a symlink to aplay. If you don't see the arecord stream in pavucontrol, that needs to be fixed. I'll assume in this mail that it works, however. If arecord can capture from the "default" device, mencoder should be able to do it too. So, change the "adevice" option from "hw.0,2" to "default". With luck, this is all you have to do. There may be multiple capture sources in pulseaudio. If the device that the mencoder capture stream is routed to is wrong, you can change it with pavucontrol in the "Recording" tab. Also the right port (line-in) needs to be selected in the "Input Devices" tab (I see you're already familiar with this, you're changing the port in the youtube video). > 2) get mencoder to capture audio from my Line-in in come other way I guess this is off-topic for this mailing list. -- Tanu
