I am currently using an FFMPEG command like:
ffmpeg -i input.mov -vf scale=1920:1080 output.mp4
to convert varying input format file to a fixed resolution MP4 output file. One final step I need is to make the output Black and White (the input files will be full color).
I have tried both -pix_fmt gray and -vf format=gray,format=yuv422p
but both just result in a black output video.
After much trawling of google, it looks like the FFMPEG exe I downloaded (for windows) wasn't compiled with the "-enable-gray" option, but I don't know if this makes any difference and don't know how to obtain a windows FFMPEG with this option enabled (building FFMPEG myself looks like a lot of hard work). Any advice welcome! Thanks.
PS I should add that the conversion I'm currently doing and any grayscale conversion could be separate steps if required.