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Old 09-30-2011, 12:34 PM   #1
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Registered: Jun 2011
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ffmpeg grabbing audio and video

im trying to record video and audio with ffmpeg using this command
ffmpeg -f alsa -i hw:1,0 -f video4linux2 -s 320x240 -i /dev/video1 -f m4v test.m4v

i get this error
[alsa @ 0x96d5be0]cannot set channel count to 1 (Invalid argument)

i tried using /dev/dsp but i dont have dsp in dev on my ubuntu machine
Thanks for any help

Last edited by glvorange; 09-30-2011 at 12:35 PM.
Old 10-01-2011, 06:38 AM   #2
Registered: Dec 2007
Location: Japan
Distribution: Debian
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Googling "cannot set channel count to 1" says that "FFmpeg provide only 1 channel for input as a default".( see the post on 31-Oct-2010 21:27 from plodder in this thread.

So, you might have to put "-ac 2" before "-i hw:1,0".
Old 10-01-2011, 10:56 AM   #3
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Registered: Jun 2011
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got it sorted thanks

ffmpeg -f alsa -ac 2 -i hw:1,0 -f video4linux2 -s 320x240 -i /dev/video0 -target pal-dvd -aspect 16:9 out.mpg


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