How do i Convert an MP4 (H264,AAC) to WebM with zero quality loss using FFMPEG?

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I have tried every flag suggested to convert an MP4 video to WebM with no quality loss but nothing seems to work. output video quality is now where near the original.

ffmpeg -i lucy.mp4 -crf 20 lucy.webm  (method 1)

ffmpeg -i lucy.mp4 -crf 4 lucy.webm   (method 2)

ffmpeg -i lucy.mp4 -b:v 320k -q:v 0 output.webm (method 3)

ffmpeg -i lucy.mp4 -b:v 1M output.webm (method 4)

Im looking for a command to have a lossless conversion from mp4 to webm.

note : I am not concerned about the output file size

ffmpeg ubuntu command-line-interface
1 Answers

The default encoder for WebM, libvpx, requires that if CRF mode is used, bitrate has to be set to 0. So,

ffmpeg -i lucy.mp4 -c:v libvpx-vp9 -crf 4 -b:v 0 lucy.webm
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