On Wednesday, 18 September 2019 10:10:16 BST Walter Dnes wrote: > I'm trying to do a video+audio capture of my desktop, e.g. a Youtube > video playing, or whatever. I've got video capture working, but not > audio. I've compiled ffmpeg with both "alsa" and "oss" USE flags and > tried the commands... > > ffmpeg -f alsa -ac 2 -i hw:0 -video_size 1920x1080 -framerate 25 -f x11grab > -i :0.0 output.mp4
The above should work, but only if your active audio card has Card ID 0. If your PC uses HDMI as the first card you'll need to adjust /etc/asound.conf accordingly to switch to your analogue audio device, or perhaps try hw:1 in the above incantation instead. Also, check your Mic is not muted with alsamixer, or your desktop GUI equivalent. > ffmpeg -f oss -i /dev/dsp -video_size 1920x1080 -framerate 25 -f x11grab -i > :0.0 output.mp4 I don't have oss experience and as I understand it pre-OSS4 is mono only(?), but again the above ought to work, as long as there is no clash with alsa. You may need jackd to plug in/out the requisite input devices and sinks - too complicated for just a simple audio recording. > In both case the video capture works, and ffmpeg claims to be > capturing audio, but I don't get any audio capture at all. What am I > doing wrong? Any more USE flags to set? Did you try USE="alsa, -speex"? -- Regards, Mick
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