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v4l to dv

I am trying to use a usb web cam in place of a dv over firewwire cam.
for testing I am using vivi, but get the following:

$ sudo modprobe vivi
$ dmesg
vivi: V4L2 device registered as /dev/video0
$ ffmpeg -i /dev/video0 -target ntsc-dv -y foo.dv
 /dev/video0: Unknown format

How do I tell what format it is?

foo.dv will be replaced with:

ffmpeg -i /dev/video0 -target ntsc-dv -y - | dvsource-file -

dvsource-file expects a dv stream like what dvgrab produces.

Carl K

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