V
DO.Ninja
Web-based Media Conversion Tools
WebM to MP4 (fixed 1280x720 resolution)
(very slow!)
The same as: fmpeg -i input.webm -vf scale=1280:720 output.mp4
WebM to MP4 files (no transcoding, attempts to force high resolutions)
WebM to Audio-only files (opus or wav)
MKV to MP4 (no transcoding)
The same as: fmpeg -i INPUTFILE -vcodec copy -acodec copy output.mp4