nicolab <robelt2525 <at> gmail.com> writes:
> Output is gray format. This is OK.
^^^^^^
> ffmpeg -i rgbtestsrc.avi -ss 1 -vf
> split[x][z];[x]format=gray[x1];[z][x1]overlay
> -vcodec libx264 3.mkv
The "format" of the output of the overlay filter
is yuva420p. This is not supported by x264, so
the output "format" file-wise is yuv420p.
The output is visually gray because you
overlayed a gray frame (x1) over another
frame (of the same size).
Sorry if I misunderstand your issue, please
remember that not everybody is a native
speaker (actually most are not).
Carl Eugen
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