How to use ssim in ffmpeg -


i looked correct place in ffmpeg command put -ssim, or private options. didn't find got 1 option working , share you. it's working don't know why.

first try without ssim , working:

ffmpeg -s cif -r 30 -i video.yuv -vcodec mpeg4 -g 12 -bf 2 -sameq video.m4v

i tried put ssim below , did not working:

ffmpeg -s cif -r 30 -i video.yuv -vcodec mpeg4 -g 12 -bf 2 -sameq -ssim video.m4v ffmpeg -s cif -r 30 -i video.yuv -ssim -vcodec mpeg4 -g 12 -bf 2 -sameq video.m4v

and here works:

ffmpeg -s cif -r 30 -i video.yuv -vcodec mpeg4 -g 12 -bf 2 -ssim -sameq video.m4v

someone have idea why worked in last case , not in commands 2 , 3?

the -ssim option relative codec (x264) use.

at least explain why case (3) doesn't work, because put option before -vcodec

remember ffmpeg option not position independent. , far remember ssim part of avcodeccontext option , should place after fflag2 below can wrong depending of ffmpeg version use.

 ffmpeg -i input ... codec .... -ssim output

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