Convert MP4 to WAV

MP4 to WAVの使い方

1. 1

   Drop the MP4

   Add up to 3 MP4 videos (or MOV, MKV, WebM) of up to 500 MB and 10 minutes each.

2. 2

   Set the sample rate and channels

   Keep the original sample rate for editing, or choose 48 kHz for video work, 44.1 kHz for a CD master, 16 kHz mono for speech recognition.

3. 3

   Normalize if the level is low

   Switch on Normalize loudness to bring quiet recordings to −16 LUFS before you edit them.

4. 4

   Extract as WAV

   Download name.wav, uncompressed 16-bit PCM that opens in Audacity, Premiere, DaVinci Resolve, Logic and FL Studio.

MP4 to WAV について

MP4 to WAV pulls the soundtrack out of a video and stores it as uncompressed 16-bit PCM in a WAV file. The audio in an MP4 is compressed, almost always AAC, so it is decoded once and written out sample by sample; nothing is compressed again, so the WAV holds exactly what the AAC decoder produces and no further loss is added. That makes it the right starting point for editing: cutting dialogue, cleaning noise, syncing sound to another camera, sampling a beat or feeding a speech-to-text or subtitle service that wants raw audio.

WAV files are large because nothing is thrown away: about 10 MB per minute for 44.1 kHz stereo and about 11 MB for 48 kHz, the usual rate of phone and camera video. A 10-minute clip therefore becomes roughly 100–110 MB of audio, far more than the MP4's soundtrack. Choosing mono halves that, and 16 kHz mono, all that speech recognition needs, is under 2 MB per minute.

The WAV can't sound better than the compressed audio it came from; it is simply easier for editing software to work with. Output is always 16-bit, which every editor accepts; there is no 24-bit or 32-bit float option. A WAV file can't exceed 4 GB, about six hours of 48 kHz stereo, which only matters for very long Pro jobs. If you only need to listen to the audio, Original or MP3 gives a much smaller file.

MP4 to WAV：よくある質問