Audio saved from the web as WebM comes from different uploaders, mixed at different loudness. Play them in a row and you're reaching for the volume every track. Pick a target and we'll level every file as it becomes an MP3, without squashing the dynamics.
Open MP4, MKV, MOV, AVI, WMV, FLV, RealMedia, DVD VOB, camcorder MTS or almost anything else, and save it as any of 32 formats. The converting happens in this tab. Your video is never uploaded.
Each file is identified from its first bytes as soon as you add it. Once the engine is loaded it is read in full, so you see the real codecs, size and length before you convert.
MPEG-4 Part 14 on the ISO base media format. The safest choice when a file has to play anywhere.
ffmpeg -i input.mp4 -map 0:v:0 -map 0:a:0? -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -c:v libx264 -preset veryfast -crf 23 -pix_fmt yuv420p -c:a aac -b:a 128k -ac 2 -f mp4 -movflags +faststart video.mp4A WebM saved from a video page usually carries no artist or title, only a filename full of extras. We split it into proper MP3 tags so your music app files it correctly. Toggle the cleanup rules to see each one's effect.
The Lanterns - NIGHT BUSES (Official Video) [4K] [x7Qp2LmA9dE].webmThe Lanterns - NIGHT BUSES.mp3A clip often opens with a logo sting and ends with a silent credits card, which sounds odd in a playlist. We find where the music really starts and stops. Raise the threshold to cut more aggressively.
WebM always carries Opus or the older Vorbis audio, never MP3, so there's always one re-encode. What else is in the file only changes the download size, not the result.
Neighbouring tools, with a typical result for each.