MP4 is the common case, but phones, cameras, screen recorders and download tools all produce something slightly different. This tool takes MOV from iPhones and Macs, MKV from rips and recordings, AVI and WMV from Windows, WebM from browsers, plus FLV, MPEG, 3GP, TS and OGV — and pulls MP3 audio out of any of them.
Same engine, same bitrate choice, same batch handling as the MP4 tool. Only the accepted input list is wider.
Why the container doesn't really matter
MOV, MKV, AVI and WebM are wrappers, exactly like MP4 — different boxes around the same kind of contents. FFmpeg reads all of them, finds the audio stream inside whatever the wrapper happens to be, and hands it to the MP3 encoder. So a screen recording in MKV and a phone clip in MOV go through the identical path and come out equally clean.
Formats that trip other converters up
Older AVI and WMV files often carry unusual audio codecs, and FLV from archived downloads can be structurally messy. Both are handled here. If a file genuinely has no audio track — some screen recordings are captured silently — you'll get a clear message saying so instead of a zero-length MP3.