[PLUG-AV] DV over USB?

[Jason Nicholls]

>
> I will make sure I know how to get my webcam going before
> we next meet up.
>
> http://lists.alioth.debian.org/pipermail/dvswitch-devel/2010-July/000365.html:
>
> ffmpeg -f video4linux2 -s vga -r 25 -i /dev/video0 -f s16le -ar 48000 -ac 2
> -i /dev/zero -target pal-dv - | dvsource-file /dev/stdin

OK been doing a little messing about, even though the Logitech Quickcam 9000
supports 1600x1200 it's not at full framerate (at least on linux). The
best I can
do is 800x600 @ 25fps which is more than enough for PAL (720x576). I
also need to run guvcviewer to ensure the exposure auto-priority is disabled
otherwise the framerate drops to ~5fps too...

So at 800x600 and 25fps (no auto-priority on exposure) then things are a little
dark, i.e. we need good lighting.

Using the above command to capture to disk (not send to dvsource) I use
between 35-40% of a CPU on my desktop (2.53Ghz Core 2 Duo).


Jason Nicholls
jason at mindsocket.com.au
0430 314 857