[LAU] Recording a video with High quality audio

[Jannis Achstetter]

Hello Ivan,

Am 20.04.2015 um 05:46 schrieb Ivan K:
> [...]
> Is there any application that can record video
> from a webcam but use an audio input other than
> the built-in mic on the cam?

This can be done very easily using gstreamer. You can construct
pipelines from single elements. Here's an example that might work for
your application:


gst-launch-1.0 v4l2src ! video/x-raw,width=640,height=360,framerate=30/1
! vp8enc deadline=30000 threads=4 ! queue ! matroskamux name=mux !
filesink location=test.mkv jackaudiosrc ! audio/x-raw,channels=2 !
audioconvert ! opusenc ! queue ! mux.

This will grab raw video from your cam, encode it, mux it and save it to
a file. Furthermore, audio will be grabbed from jack, encoded and also
muxed to the same file. If your webcam supports it, you can also take an
encoded stream from the device and add audio without re-encoding:

gst-launch-1.0 v4l2src !
video/x-h264,width=640,height=360,framerate=30/1 ! h264parse ! queue !
matroskamux name=mux ! filesink location=test.mkv jackaudiosrc !
audio/x-raw,channels=2 ! audioconvert ! opusenc ! queue ! mux.

Here's some docs if you need further info:
http://docs.gstreamer.com/display/GstSDK/Basic+tutorial+10%3A+GStreamer+tools

Best regards,
	Jannis