using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 qscale is ignored, -crf is recommended. Please use -q:a or -q:v, -qscale is ambiguous ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developersīuilt with Apple LLVM version 9.0.0 (clang-900.0.39.2)Ĭonfiguration: -prefix=/usr/local/Cellar/ffmpeg/3.4.2 -enable-shared -enable-pthreads -enable-version3 -enable-hardcoded-tables -enable-avresample -cc=clang -host-cflags= -host-ldflags= -disable-jack -enable-gpl -enable-libmp3lame -enable-libx264 -enable-libxvid -enable-opencl -enable-videotoolbox -disable-lzma The resolution of the two videos is the same, however the size dropped from 24,3MB (.webm) to 1,5MB (.mp4) after conversion. However, the quality change is still tremendous, see the difference below.

Here is the most promising command: ffmpeg -i vidoe.webm -qscale 1 video.mp4 I did research this topic and tried different approaches to solve this. mp4 video using ffmpeg (3.4.2 on mac) the result is somewhat blurry.

Ffmpeg webm to mp4