[FFmpeg-user] Grayscale x264 convertion

[Andrew Gora]

Yes, -vf format=gray is working!

Thanks to all, especially to Roger Pack.

Carl Eugen, yes, gray alone is sufficient. Moreover, format=yuv422p is
incompatible with the high profile.

Is it sufficient to code grayscale video with 50% of bitrate comparing
to color coding? I dont know about yuv420p (have no idea about planar
formats), but in yuv422 50% of bits belong to luminance channel.

Thanks!