[Libav-user] How to change bit depth in -pix_fmt?

[Amir Rouhi-Rmit]

Hi everybody
I know that i can use -pix_fmt for desire pixel format in output. When i
list the different switches for this parameter i can see many formats such
as yuv420p and yuvj420p.
First i would be pleased if somebody explain whats the difference between
these two format?
secondly how can i change the bit depth from 8 (which is default in these
two format) to something else like 3 or 4?
Regards
Amir
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