[FFmpeg-user] converting a video without sound : Error while opening encoder for output stream #0.1

[Access-Dev]

> -an, but this should not happen. What's the output of ffprobe on the 
> file, and can you play it using ffplay.

Hi,

i m used an automated process , so I want some generic option that can 
do the trick for all videos (with and without sound)

I already noticed -an is working but I guess it will delete sound track 
for all videos , which is not what I want.