When I try to convert an .mp4 file/buffer with full type, it does not work

[chikof]

I was looking the code, and I give up 🏳.

[erickythierry]

Version 4.x started using ffmpeg to format the input file to .webp type, but it doesn't work well for gif and mp4 files (version 3.x only modifies the metadata of webp files)