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Question to API filevpedisplay & modetest

Hi experts,

Here has 2 questions.

1. Does modetest API can dynamically change resolution to our monitor? That is, if my monitor default with 1920x1080 resolution,

could I use "modetest -s 4:1024x768" to change lower resolution (I only see color bar on my monitor)?

Or there has another solution to achieve it.

2. What are the input attributes to filevpedisplay stand for? I use the following command to output a source file named "255_red.yuyv" with resolution

1920x1080:

command: filevpedisplay 255_red.yuyv 200 200 yuyv 1920 1080 yuyv 0 0 640 480 100 0 -s 4:1920x1080

2.1 Why <src_w> <src_h> with value 200 200 can successfully output this picture with resolution 1920x1080

2.2 What the high light attributes stand for?

<src_w>, <src_h>, <dst_w>, <dst_h>, <top> ,<left>, <w>, <h>, <inter>, <trans>

Thanks in advance.