Programming using v4l2

[Leopold Palomo-Avellaneda <lepalom (at) wol.es>]

Hi,

we have a video capture card that give us a mpeg4 stream. I'm using spook [1] 
and I can send the stream via rtsp and see them with mplayer. I don't have 
raw images in the /dev/video* devices, and I have them compressed.

I have some doubts about the v4l2 mechanism and the devices. I would like to 
develop a little program to manipulate the images, and I don't know to begin. 
First of all, if I have a mpeg4 stream, and I would like to use it, I need to 
decode them. I have seen that the libavcodec let you access to a file in 
several formats, one of the mpeg4.

I understand that the schema is like:
1) read the the device
2) using the libavcodec, decode the mp4stream
3) then process the video

But, how I can read a device? it's a normal file? how can I see the 
characteristics? there's some tutorial?

Well, to many questions and I'm sorry if they are more simple, but I'm really 
lost.

Regards,

Leo

[1] http://www.litech.org/spook/

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