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Editorial Team
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Asked: 2026-06-11T11:31:27+00:00

I’m having a problem trying to record audio+video from my webcam to a file.

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I’m having a problem trying to record audio+video from my webcam to a file. If I use videotestsrc and autoaudiosrc I get everything right (read as in I get a file with audio recorded from the webcam’s mic, and test-video image), but as soon as I replace videotestsrc with v4l2src (or autovideosrc) I get Error starting streaming on device '/dev/video0'.

The command I’m using:

gst-launch-0.10 videotestsrc ! queue ! ffmpegcolorspace! theoraenc ! queue ! oggmux name=mux autoaudiosrc ! queue ! audioconvert ! vorbisenc ! queue ! mux. mux. ! queue ! filesink location = test.ogg

Why is that happening? What am I doing wrong?

EDIT:

In fact, something as simple as

gst-launch-0.10 autovideosrc ! autovideosink autoaudiosrc ! autoaudiosink

is failing with the same error (Error starting streaming on device '/dev/video0')

Replacing autovideosrc with videotestsrc gives me test image + real audio.

Replacing autoauidosrc with audiotestsrc gives me real image + test audio.

I’m starting to think that this is some kind of limitation of my webcam. Is that possible?

EDIT:

GST_DEBUG=2 log here: http://pastie.org/4755009

EDIT 2:

GST_DEBUG=”v4l2*:5″ (gstreamer 0.10): http://pastie.org/4810519

GST_DEBUG=”v4l2*:5″ (gstreamer 1.0): http://pastie.org/4810502

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1 Answer

  1. Editorial Team

    Please do a
    gst-launch-1.0 v4l2src ! videoscale ! videoconvert ! autovideosink
    Does that run? If not repeat as
    GST_DEBUG="v4l2*:5" GST_DEBUG_NO_COLOR=1 gst-launch 2>debug.log ...
    and check the log for errors. You also might want to run v4l-info (install v4l-conf under debian/ubuntu) and report what formats your camera supports.

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