[FFmpeg-user] Converting ProRes 422 to mp4

[saikari.hakala at laposte.net]

Hello, 

I have a mov ProRes 422 video file (with no audio) that I need to convert to mp4 without losing quality. 
I have tried to do this using the qscale option, but a warning appears saying qscale option is ignored. 
Could anyone give an example command in ffmpeg to achieve this? 
I am running ffmpeg on windows. The version is: 

ffmpeg version N-71418-g818e889 Copyright (c) 2000-2015 the FFmpeg developers 
built with gcc 4.9.2 (GCC) 

Thank you very much 

Saikari