Maya Plugin export options

Is there any way to control the number of the frame padding in the export part of the animation in Arnold Render settings? After I take the time to write a name for the file I pick a specific frame padding. When I press render the name changes over to v0000001.png and takes over the image resolution after I have set it up. When I use FFmpeg to convert the image sequence I keep getting errors.

Here is what I get.

Input #0, png_pipe, from ‘v0000001.png’:
Duration: N/A, bitrate: N/A
Stream #0:0: Video: png, rgb24(pc), 640x360 [SAR 100:100 DAR 16:9], 25 fps, 25 tbr, 25 tbn
Unknown pixel format requested: 420p.

Here is the code I put in.
C:\Users\Oscar\Documents\Lumina CameraSetup Start\images\Dolphin_18+LEIA\masterLayer\LeiaCamera1_view00>ffmpeg -r 30 -i v0000001.png -pix_fmt 420p LeiaCamera1.mp4

Any help or direction would help.

I was able to figure it out and make a video on my own making the quad format outside of the plugin used by Maya. Also, the plugin eventually started working as well.