[FFmpeg-user] converting to non HD avi with ffmpeg

[Kevin Wilson]

Hi,
I have downloaded from the web a video file with webm extension:
ubunutuArm.webm (some lecture in video)

Now, I converted it to avi thus:
ffmpeg -i ubunutuArm.webm ubunutuArm.avi

and put the ubunutuArm.avi on disk On Key.
When trying to view it on TV with a DVD I see this
messsage:
"HD is not supported".
Indeed, HD is not supported in my DVD and TV.
Is there a way I can convert this video file with ffmpeg
to an AVI so the result will be non HD ?

(Second question: given some avi file, is there a way
I can know whether it is in HD or not ?)

Regards,
Kevin