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You need to select your inputs with v4l2-ctl. If you don't already have it, install v4l-utils.
Examples:

Show list of available video inputs


v4l2-ctl --list-input
ioctl: VIDIOC_ENUMINPUT
...

Kinda need to know what version of kubuntu your using. Older versions of kubuntu scan tables are in package "dvb-apps" , newer versions they are
in package "dtv-scan-tables"

There should be symlinks to your capture cards in /dev/v4l/by-path/ .
Mine look like this, yours will probably be different.

pci-0000:03:06.0-video-index0
pci-0000:03:06.0-video-index2 ...

https://trac.ffmpeg.org/wiki/AudioVolume

Try this

ffmpeg -i ${input} 2>&1 | sed -n "s/.*, \(.*\) fp.*/\1/p"

You could try to remux the video like this.


ffmpeg -i VideoClip2.mp4 -c copy NewClip2.mp4

try this


ffmpeg -f alsa -i pulse -f x11grab -s 1920x1080 -i :0.0+1920,0 -target ntsc-dvd -aspect 16:9 -f tee -map 1:v -map 0:a "output.mpg|output2.mpg"