[Mp4-tech] H.264/YUV construction/

[Thammi_Reddy]

Hi,
Could you please answer some very basic concepts?
References:  (JM model, 3 frames of foreman)
1.foreman_part_qcif.yuv 
2.foreman_part_qcif_422.yuv 
3.foreman_part_qcif_444.yuv 
QUESTION1: How is the YUV format constructed, I mean all Y;s  then Cb
Crs, etc... 
I have tried entered a single ASCII symbol in notepad (with ATL + <>).
When played this with YUV player it took 4 frames for 4:2:0.
The same ASCII symbol under DOS is displayed as 2 frames of 4:2:0. 
I am unable to separate one frame of foreman from 3 frames of YUV file. 
QUESTION2: How can we convert Webcam output into YUV player so that I
can apply H.264 Encoder and Decoder and display back to a format
displayable in monitor say windows media player etc?
Many thanks in advance.
Thammi Reddy
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