Trying to convert an MP4 to WEBP with ffmpeg with different lossless/compression settings, but getting the same result

Question

I am trying to convert an MP4 video to WEBP.

I am trying different -lossless and -compression_level settings (as described here https://ffmpeg.org/ffmpeg-codecs.html#Options-30), but all the output videos have identical disk size.

-lossless can either be 0 or 1 and -compression_level can be from 0 to 6

For example

ffmpeg -y -i input.mp4 -vcodec libwebp -lossless 1 -compression_level 6 -loop 0 -preset default output_lossless1_comp6.webp

and

ffmpeg -y -i input.mp4 -vcodec libwebp -lossless 0 -compression_level 0 -loop 0 -preset default output_lossless0_comp0.webp

What have I missed here?

Answer 1

Remove -preset default. It is overriding -lossless 0 -compression_level 0. Also consider removing -vcodec libwebp and letting ffmpeg automatically choose either libwebp or libwebp_anim.