how to output analog signal with dm365

You can use VPBE for this.

I think you can use examples from DVSDK, e.g. encodedecode.

DVSDK_4_02/dvsdk-demos_4_02_00_01/dm365/encodedecode/encodedecode.txt:
NAME
       encodedecode - encode and decode video

SYNOPSIS
       encodedecode [options...]

DESCRIPTION
       This demo uses the Codec Engine to encode data from the capture device
       into an intermediate buffer before the data is decoded to the display
       framebuffer.

       The DM365MM and CMEM kernel modules need to be inserted for this demo
       to run.  Use the script 'loadmodule-rc' in the DVSDK to make sure both
       kernel modules are loaded with adequate parameters.

OPTIONS
       -y <1-7>, --display_standard <1-7>
             Sets the resolution of the display. If the captured resolution
             is larger than the display it will be center clamped, and if it
             is smaller the image will be centered.

                    1       D1 @ 30 fps (NTSC)
                    2       D1 @ 25 fps (PAL)
                    3       720P @ 60 fps      [Default]                   
                    7       480P @ 60 fps