some questions about VIDIOCGMBUF

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I'm using the mmap method of reading images from my tv
card. Checking the size variable in the struct
video_mbuf, it shows 4259840bytes. That is the size of
1 single frame right? 
Since I want to do recording of the video and my
program runs at about 25 frames per second, recording
each frame uncompressed will take up a lof space(I've
tried recording each frame but frame rate will drop as
the disk i/o is not fast enough). 
Is there any fast and easy to use library to compress
the frames(I want to be able to extract frame by frame
for processing later on)? I have looked around and am
confused by the seemingly large number of available
libraries, like mpeg, mjpeg, png, jpeg, divx, etc. 

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