Narcissus, mplayer and opencv


I wanted to see opencv demos on beagleboard so I created the X11
image using Narcissus.
For some reason it doesn't run mplayer giving error
v4l2: unable to open '/dev/video0' : No such file or directory
It runs OK on the same hardware with a console image created with the
same tool.
What is missing?

As well after
'opkg update'
I have
opkg: Invalid gzip magic


The output from Narcissus is:

Preconfiguring image
Installing packages:
Assembling image
Click to download your janek25052009 image for beagleboard [124.63

OK, it's not me, it's you.
Today I have tried another console image and instead I had an X11
And yes, I ticked the right boxes.
It is a pity as it worked well for a while and now is falling, but
nothing is perfect.

Another question.
I have in my boot.scr the following

setenv bootcmd 'mmcinit; fatload mmc 0:1 0x80300000 uImage; bootm
setenv bootargs 'console=ttyS2,115200n8 console=tty0 root=/dev/
mmcblk0p2 rw rootfstype=ext3 rw rootwait omap-dss.def_disp=lcd

It works with kernel 2.6.28 , but with kernel 2.6.29 gives a very low
screen resolution.
Anyone can help me to fix it?
Are there any different bootargs for 2.6.29 compare to 2.6.28?



Hey Jan,

In 2.6.29 the dss command has changed.

For Linux Kernel 2.6.29 and higher using DSS2:


You might want to adjust the values to your liking

This info can be found at

I hope this helps.


Hi Miquel,

It did help indeed.
Much appreciate it as you saved me a lot of time and frustration.
Thanks again.