21 Apr
2015
21 Apr
'15
6:50 a.m.
Am 20.04.2015 um 21:25 schrieb Ivan K:
Thank you for your help; this is a lot to take in,
though I am not
adverse to working on the command line, and many times I prefer it.
Good to hear that :)
In your first example, it seems I need to substitute
something
for "jackaudiosrc". What might I put there?
Right, I was assuming you are using the JACK audio server. If not you
can use "alsasrc" or "pulsesrc", depending on your setup. You can
always
get a list of available elements using "gst-inspect-1.0".
Also, I am surprised to see the use of the
"!" character as
opposed to the pipe "|". Is the "!" particular to bash?
The "!"s are not specific to bash but to gstreamer. It's not several
processes that are started and piped together by bash but it's several
gstreamer elements that are piped together by gstreamer. Hence, the "|"
doesn't work here.
I am taking a look at the documentation. Thanks
again.
You're welcome.
Best regards,
Jannis
Jannis Achstetter <jannis_achstetter(a)web.de>
wrote:
Am 20.04.2015 um 05:46 schrieb Ivan K:
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[...]
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.